Abdul Hadi Bin Abd Rahman

Universiti Teknologi PETRONAS | UTP · Department of Geosciences

Palynological analysis was conducted on one hundred and twenty-four samples collected from ten sedimentary outcrops in Sangan, Tatau, Bintulu and Similajau areas of central Sarawak. These outcrops form part of the Oligocene-Miocene marginal marine successions of the Nyalau Formation. Rich palynomorph assemblages were recovered from the samples and...

Deep‐water massive sandstones (DWMS) are characterized by large volumes of sand accumulations which are considered as potential reservoir intervals in deep‐marine environments. Lithological variations and bed thickness statistics are used to interpret the distribution of massive sandstones in a deep‐marine fan‐lobe system. These massive sandstones...

The AX Field is located 167km off NNE Kerteh, Terengganu of Peninsular Malaysia, southwest of Malay Basin. This study is focused on the 3D seismic analysis of the Lower Miocene fluvio-deltaic Group I. The objective of the study is to evaluate the geomorphological evolution of fluvial succession and interpret the possible intra-basinal and extra-bas...

Three (3) outcrops belonging to the Pedawan Formation found along Jambusan-Semadang Road in the Siburan area are characterized by well-developed soft-sediment deformation structures (SSDS). SSSD is formed due to instability, which possibly results from factors like rapid sedimentation, overloading, or earthquake. The SSDS in Siburan, in the form of...

Soft-sediment deformation structures are present within the deep-marine fan of the West Crocker Formation, Sabah Basin, NW Borneo. Focus of this study is to highlight the impact of seismic and aseismic activities on the development of these structures and their distribution in deep-marine fan. Twenty-nine types of deformational structures were iden...

Deepwater lobes constitute a significant volume of submarine fans and are primarily believed to exhibit a simple sheet geometry. However, recent studies interpret the geometries of these deep-marine lobes as distinct with respect to the complexity of the facies and their distribution. Hence, a conceptual model of deep-marine sediments is essential...

Several outcrops of Pedawan Formation (Jurassic – Cretaceous age) found along the Borneo Heights road in the Siburan area were evaluated. Detailed facies analysis of four (4) outcrops were undertaken, and seven (7) lithofacies were identified. These are, i) S1: Massive, ungraded medium-grained sandstone, ii) S2: Graded, coarse to fine-grained sands...

In the Sibu-Tatau region of Sarawak, the Belaga Formation (Late Cretaceous- Late Eocene turbidites) is interpreted in relation to a submarine fan model deposited in the extinct ocean basin of the proto-South China Sea. A number of clastic rocks, which include sandstone, siltstone, mudstone, and black shale, define the formation. While it is conside...

High and low resistivity values is an alarming phenomenon that is usually associated with a very complicated reservoir history and worth looking into. Ordovician sandstone reservoirs are the primary oil producers in the Murzuq basin oil fields that is characterized with an average porosity of 14%, permeability range 410-10,760 md and clean quartz a...

The Rajang Group sediments in central Borneo form a very thick, deep-water sequence that was deposited in one of the Southeast Asian's largest ancient submarine fans. In Sarawak, the Lupar and Belaga Formations from the Reagan Group, characterized by turbidities and large debris flows, deposited in an interval of at least 30 Ma between the Late Cre...

A timely and updated review of the Late Paleogene deep marine sedimentary successions is vital for a better understanding of the historical advances in sedimentology and stratigraphic evolution of West Sabah. The main objective of the study is to discuss the facies characteristics and depositional environment of the Late Paleogene rock formations....

The Melor-field of the Malay basin has been investigated using several seismic attributes to present the geological elements accurately. This study used a new seismic attribute to represent the geological features of the study interval. Besides, the application of some seismic attributes was applied to reveal the structural and geomorphological fea...

In this study, we report on the belemnite genus Hibolithes from the Pedawan Formation (Jurassic – Cretaceous) in Sarawak, on the island of Borneo (Malaysia). A total of four fragments of belemnite rostra were discovered and identified. Two fragments measuring about 130 mm are relatively intact, with only part of the alveolar region missing. A third...

This paper presents lithofacies types of exposed Nyalau Formation in areas around Bintulu town, Sarawak, Malaysia. The Early Miocene exposures of Nyalau Formation provide a unique opportunity to study the sedimentology and sequences at reservoir scale in order to und erstand the depositional and post depositional changes. Here, we describe the resu...

Belaga Formation is the most widespread and a betterknown formation of Rajang Group (covering up to 95%) in the lower Rajang area (central Sarawak). The thick deep marine sediments of Rajang Group represent a major submarine fan and/or to some extent an accretionary prism (Hutchison, 1996; Moss, 1998) and is one of the world’s largest ancient subma...

BACKGROUND AND OBJECTIVE Analysis of seismic attributes has been an integral part of reflection seismic interpretation for over two decades now. Seismic attributes are tools for inferring geology from seismic reflection data. These attributes aid seismic interpretation by revealing hidden features, by identifying similar patterns, and by quantifying...

The Paleogene of West Sabah comprised of early Paleogene Trusmadi and East Crocker formations while the late Paleogene include West Crocker and Temburong formations. Trusmadi and East Crocker formations represent the eastward continuation of Crocker-Rajang Group that was metamorphosed, folded and uplifted in late Eocene. These early Paleogene succe...

The relative volume of clay minerals contributing to the microporosity is the main feature that influences the estimation of water saturation in hydrocarbon reservoirs. For developing a genuine understanding of reservoir quality, the present study elucidated the petrography, quantification of clay minerals, and microporosity, besides their effect o...

Facies models for transgressive mixed- energy estuarine deposits are under-reported in the Sarawak Neogene basin. Hence, facies and stratigraphic architecture of fluvial to tidal in a mixed tide- wave - influenced estuarine complex of the Nyalau Formation is presented here which was developed in the Sarawak basin during the Late Oligocene-Early Mio...

Between 1930 and 1940, oil shows as well as gas that existed in the reservoir in gaseous phase rather than in solution (free gas) were found in the Mukah area. However, none of the discoveries were developed. Drilling results suggest that oil shows are common, while gas shows are present at deeper depths. Exploration requires a knowledge of heterog...

Between 1930 and 1940, oil shows, as well as free oil were found in the Mukah area, but none of the discoveries were developed. Drilling results suggest that oil shows are common, while gas shows are present at a deeper depth. Exploration requires a knowledge of heterogeneities in the rock. This paper is an introduction to a thematic set on the cha...

The coastal region of Sarawak is primarily covered by thick Neogene coal-bearing mudrocks. The mudrocks are composed of shale or mudstone, alternating with sandstone layers and locally intercalated with coal beds. Carbonaceous material in the mudrocks in the form of maceral vitrinite is substantially important to generate gas. The study of pore-typ...

Advances in photogrammetry have eased the acquisition of high-resolution digital information from outcrops, enabling faster, non-destructive data capturing and improved reservoir modeling. Geocellular models for flow dynamics with in the virtual outcrop in siliciclastic deposits at different sets of sandstone facies architecture remain, however, a...

Newly exposed outcrop of Miocene shallow marine sandstone in Sandakan Formation, allows characterization of the facies distribution and petrophysical properties of shoreface to offshore transition environment. Six facies are defined: (1) Poorly bioturbated Hummocky Cross Stratified (HCS) sandstone (F1), (2) Moderately bioturbated HCS sandstone (F2)...

Two sets of contrasting oil-prone source rocks have been evaluated and compared - marine shales of the Jurassic Madbi Formation in the Masila Basin, Yemen and Cenozoic coals and organic-rich sediments of the Nyalau Formation in Sarawak, Malaysia. An assessment based on organic facies characteristics, has been carried out on these sediments to disti...

A significant percentage of the world’s hydrocarbon reserves are found in shallow marine sandstone rocks. Understanding reservoir connectivity and quality of shallow-marine sandstones from outcrop analysis and facies characteristics is a challenging task. Here, we analyze well-exposed outcrops of the Miri Formation, Sarawak Basin, Borneo, to charac...

significant percentage of the world’s hydrocarbon reserves are found in shallow-marine sandstone deposits. Understanding the internal characteristics, distribution, geometry and lateral extent of these sandstones in the subsurface is therefore, an essential part of successful exploration and production strategy. The aim of this study was to documen...

The Late Miocene Lambir Formation is extensively exposed along the road from Bekenu to Miri near the Bukit Lambir National Park. This formation is characterized by a succession of poorly consolidated sandstone and sand interbedded with soft clay in several exposures. Four sedimentary facies from three (3) outcrops of the Lambir Formation have been...

The December 2014 Kelantan floods were the worst on records in terms of depth and extent of inundation as well as damages to properties and infrastructure. Therefore, a comprehensive and integrated flood monitoring, forecasting, and warning methods are needed to allow planning of responses to potential future floods by the government and related en...

Reservoir connectivity is one of the main subsurface uncertainties in the assessment and improvement of many oil and gas fields. The main objective of this paper is to analyze the static and dynamic connectivity of the selected shallow-marine sandstone facies through construction of gridded-based units for flow behavior/patterns. Prior to the gener...

Reservoir connectivity and modeling in siliciclastic deposits are quit challenging in terms of its distribution and quality prediction. The objective of this paper is to demonstrate the different aspects of reservoir properties to construct static connectivity model and its heterogeneity distribution in siliciclastic Miri Formation, Borneo. Field d...

Two sets of contrasting oil-prone source rocks have been evaluated and compared- marine shales of the Jurassic Madbi Formation in the Masila basin, Yemen and Cenozoic coals and organic-rich sediments of the Nyalau Formation in Sarawak, Malaysia. An assessment, based on organic facies characteristics, has been carried out on these sediments, to dist...

Newly outcrops exposed in the West Crocker Formation have led to the detail sedimentolgical analysis of the formation. Eight sedimentary facies have been recognised in which it was divided into three main groups: (1) sand-dominated facies (F1-F2), (2) poorly- sorted unit mixed sand and mud-dominated facies (F3), and (3) mud-dominated facies (F4-F5)...

Modeling of littoral sandstone reservoirs are challenging due to different scales of heterogeneities. This study introduces an improved understanding of internal structures of sandstone and the way heterogeneities in facies distribution can affect variance in reservoir flow pattern. The methodology presented in this study is based on outcrop study...

Modeling of littoral sandstone reservoirs are challenging due to different scales of heterogeneities. This study introduces an improved understanding of internal structures of sandstone and the way heterogeneities in facies distribution can affect variance in reservoir flow pattern. The methodology presented in this study is based on outcrop study...

The Nyalau Formation (Upper Oligocene-Early Miocene) is the onshore extension of the oil and gas-bearing Cycles I and II of the Tinjar Province in offshore Sarawak. Little detail study on the ichnological characteristics has been carried out on this formation. Newly exposed outcrops of the Nyalau Formation in south Bintulu (Figure 1) allows detail...

This paper presents the results of palynological analysis of outcrops belong to the Nyalau Formation located in the south Bintulu area of Sarawak, Malaysia. This palynological study is a part of high-resolution biofacies project which is aimed to reconstruct the palynological succession in the Nyalau Formation. In general, the study was emphasized...

Shallow marine sandstones are substantial hydrocarbon reservoirs located around the globe and in Southeast Asia.Understanding the internal characteristics, distribution, geometry and lateral extent of these sandstones are essential parts of successful exploration and production strategy. This study presents the first detailed work on reservoir sand...

The Sandakan Formation of the Segama Group is exposed across the Sandakan Peninsular in eastern Sabah. This Upper Miocene part of the Segama Group unconformably overlies the Garinono Formation and is conformably overlain by the Bongaya Formation. This formation was investigated with detailed logging of outcrops and microfossils analysis in order to...

About 80 % of the Kinta Valley and 40 % of the Kuala Lumpur area, both of which are densely populated, are underlain by limestone bedrock. Dissolution of the limestone bedrock by the slightly acidic rainwater which seeps into the bedrock along discontinuities gives rise to a subsurface karstic morphology with features like steep pinnacles and deep...

This paper discusses the application of wireline logs in the determination of depositional environment. A suite of wireline logs from the well A38 is collected from the Ministry of petroleum in Sudan and consists of GR, SP, R, Rs, RMSL, CNC, ZDEN, and DT, which comprise the materials for this study. Petrel software was used to display these logs. B...

This work presents the detailed facies analysis of the Begrih Formation exposed along the Mukah–Selangau road, Sarawak, East Malaysia. The Begrih Formation shows a variety of sedimentary facies in terms of composition, sedimentary structures, bed geometry, and microfossils. Fifteen sedimentary facies from seven (07) outcrops of Begrih Formation hav...

A significant percentage of the world's hydrocarbon reserves are found in shallow marine sandstone rocks. Understanding the outcrop geometry and static connectivity of these shallow marine sandstones in terms of reservoir model, is a challenging task. This research work focuses on outcrop analysis and characterization of six well-exposed marginal t...

The Sarawak Basin is one of the most prolific hydrocarbon bearing basins in South East Asia. However, extensive debates and hypotheses concerning its origin have perplexed the Asian scientific community for long. The quest for revealing the birth of this basin is an amalgamation of various data and studies. Subsidence history can throw light on the...

The Malay Basin is located offshore West Malaysia in the South China Sea, within north central region of 1st order Sunda Block. The basin developed partly as a result of tectonic collisions and strike-slip shear of the Southeast Asia continental slabs, as the Indian Plate collided into Eurasia, and subsequent extrusion of lithospheric blocks toward...

Tectonism constitutes one of the major controls of sediment in-fill within sedimentary basins around the world. Understanding the tectonic activity that shaped the architecture of the basin and aided in facies distribution, plays a vital role in basin analysis and forward modeling. A few outcrops from the Nyalau Formation in Bintulu, Sarawak, East...

The Baram Delta Province is located in the northern part of Sarawak (West Baram Delta) and extends north-eastward into Brunei and further into the south-western part of Sabah (East Baram Delta). The delta is a Neogene basin which developed over an accretionary wedge implying Cretaceous to Eocene sediments during the Late Eocene to Late Miocene time...

The outcrop of shallow marine sandstone, Belait formation at Meragang Beach, Brunei Darussalam have long been regarded as tide-, wave-and storm-dominated environment that reveals the reservoir heterogeneities and variation in sand body geometry. Intensive outcrop study methods were available from previously conducted work on Belait Formation. But f...

The key challenges for future energy resources of the worlds are expected from unconventional resources. Indonesia and Malaysia are neighboring countries which endeavor to discover shale gas. Therefore, a review of the non-marine Tertiary shales in the Pematang Group and Bampo Formation of the Central and North Sumatra Basin, Indonesia as well as t...

Cores from E Group sections (Miocene) from the central Malay Basin have been the subject of studies to provide the basis for improved understanding of reservoir sequences. These studies included detailed core description and dense sampling for combined micropalaeontological and palynological analysis. Reservoir sandstones in the cored sections were...

This study on the sedimentological and reservoir petrophysical properties (porosity, permeability, density, sonic velocity) of sandstones were conducted on the sedimentary rocks belonging to the Miri Formation (Middle Miocene) from Miri and Nyalau Formation (Middle Miocene) from Bintulu in Sarawak. The objectives are i) to investigate and determine...

In the Nyalau Formation (Late Oligocene to Early Miocene in age) exposed near Tg. Similajau and Bintulu areas, structural features indicate that penecotemporaneous deformation is common. These features include (1) "disharmonic" thrusts and associated folding within shaly intervals, (2) detached normal and reverse faults within mud-dominated interva...

Rock exposures around the town of Miri, Sarawak, belonging to the Miri Formation (Middle Miocene strata), represent the uplifted part of the subsurface sedimentary strata of the Miri oilfield. Data derived from outcrop studies concerning facies and sand body characteristics, and petrophysical properties are crucial for subsurface reservoir characte...