May 2015
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5 Reads
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9 Citations
The lithology of the Chang-6 formation in Zhangtai area, Eastern Ordos Basin, is mainly gray and grayish fine-grained feldspathic sandstones, in which there are interbeds of dark gray mudstone and gray-black shale. According to core observation, slice identification, particle-size analysis and physical property analysis, it is held that the Chang-6 sandstone reservoirs are mainly lacustrine delta deposits, in which two subfacies of delta plain and delta front are developed, and there are a variety of microfacies. The distribution of oil reservoirs is controlled mainly by sedimentary characteristics, and parts are also affected by other factors. The distributary channels of delta plains and the underwater distributary channels of the delta front are main oil-bearing sand-bodies.