Guoqiang Luan

• PhD
• China University of Petroleum, East China

The Ben Nevis sandstones in the Jeanne d’Arc Basin in offshore eastern Newfoundland have abundant carbonate cements, and are the primary hydrocarbon reservoirs of the White Rose Oilfield. A multiapproach of petrographic, carbon and oxygen isotopic, and in situ geochemical analyses were applied to investigate the origin of the carbonate cements in t...

The composition of formation waters in the Dongying Depression provide important clues about regional water-rock interactions. Chemical analysis (181 samples) of formation waters form the Shahejie Fm (58 wells) in the Niuzhuang oilfield suggest two main geochemical facies, the chloride-magnesium (Cl–Mg) and bicarbonate-sodium (HCO3–Na) facies (pH =...

In most organic-rich shale reservoirs, dolomite is widely distributed and has different types and crystal sizes. However, the characteristics and formation mechanism of the dolomites in organic-rich shale are still poorly understood. Petrographic and geochemical analyses were performed to interpret the formation of dolomite in the lacustrine organi...

Diagenetic carbonate cements occur throughout Eocene turbidite lithic arkose in Niuzhuang sag, eastern China, displaying as sporad-ical siderite, dolomite, calcite 1, and massive ankerite and calcite 2. Petrographic and geochemical investigations suggest that the non-ferroan calcite 1 (d 13 C carbonate (carb) +3.1‰ to +4.7‰ Vienna Pee-dee belemnite...

The Bathonian-Callovian (Middle Jurassic) Dorgali Formation in eastern Sardinia (Italy) consists of dolomitized oolitic grainstone and records a complex diagenetic history. Petrographic examinations revealed three main phases of replacive (D1, D2) and fracture-filling (D3) dolomites with crystal-size ranges of <4–50 μm (dolomicrite to dolomicrospar...

This paper establishes the sedimentary facies distribution model in the middle of the third member of the Shahejie Formation (Es3z), deep-lacustrine and turbidite fans in the Niuzhuang Sag. Lacustrine turbidite systems can form high-quality oil and gas reservoirs and the understanding of these systems is of great significance for lacustrine basins...

The subsurface distribution of carbonate cements in sandstones is cornerstone in understanding the fluid regime and origin of cements to shed the light on hydrocarbon migration. Petrography, cuttings, cores, well logs, and seismic data were integrated to better understand the distribution of carbonate cements in the Eocene turbidite-delta sandstone...

The origin of fibrous calcite veins developed in organic-rich shales, has attracted great attentions. However the growth direction, formation temperature and stress state are still controversial. The calcite veins in organic-rich shale from lower Es3 to upper Es4 in the Jiyang Depression has been analyzed with electron backscatter diffraction techn...

The quality of a caprock is closely related to its thickness. Statistical data show that there is an obvious positive correlation between caprock thickness and hydrocarbon column height. This report established that the starting pressure gradient is the key factor in the relationship between caprock thickness and hydrocarbon column height by discus...

Shale oil reservoirs need fracturing in order to achieve commercial productivity. A key factor influencing the fracturing process is shale fracability, which is strictly dependent on rock fabric. In this study, we focused on the lacustrine shale oil reservoirs located in Dongying Sag and in the Northern Jiangsu Basin. Through X-ray mineral diffract...

The bedding-parallel fibrous calcite veins in black shales are common in sedimentary basins and retain significant information about shale diagenesis and organic matter evolution. However, the origin of the bedding-parallel fibrous calcite veins in black shales is still of great controversy. Carbonaceous black shales of Es4s–Es3x interval are the m...

Hyperpycnal flows are dense, formed when a sediment-laden fluid plunges into the bottom of a water body and flows basinward. After a large number of literature review, we summarized the development conditions, evolution process and depositional features of hyperpycnal flow. The formation of hyperpycnal flow is controlled by tectonic and climatic co...

A method of computing cap rock's effective thickness is proposed based on that cap rock's heterogeneity may result in different capillary sealing ability within cap rock. Using data of thin section, SEM, breakthrough pressure, porosity, permeability and other test data of argillaceous cap rock and sandstone reservoir, the boundary between cap rock...

The development of expulsion fractures in organic-rich shale is closely related to hydrocarbon generation and expulsion from kerogen. Organic-rich shales from the upper part of the fourth member and the lower part of the third member of the Paleogene Shahejie Formation in the Jiyang Depression, Bohai Bay Basin, East China, are used as an example. B...

Based on the study of Paleogene shale in Subei Basin, and combining results of the Marcellus shale, this paper defined the concept of organic-matter pore, summarized its types and characteristics, discussed its influencing factors and finally concluded evolution rule of organic-matter pore. The results show that organic-matter pores generally refer...

Taking the Paleogene organic-rich shales from the Dongying Sag and Zhanhua Sag of Jiyang Depression in Bohai Bay Basin and Northern Jiangsu Basin in Eastern China as examples, this paper researches the types and characteristics of natural fluid pressure fractures and their effects on hydrocarbon primary migration. The study shows that fluid overpre...