鄂尔多斯盆地延长组砂质纹层发育特征与油气成藏

doi:10.11743/ogg20180309

Abstract

Abstract: There are a lot of sandy laminations in the Triassic Yanchang Formation shale in the central and southern Ordos Basin,but their influence on hydrocarbon accumulation is not clear.In order to reveal the geological characteristics of sandy lamination and explore its favorable effect on hydrocarbon accumulation,we have studied its lithologic and porosity-permeability characteristics,fracture development as well as oil and gas accumulation,through integration of methods such as core observation,microscopic identification,and organic geochemical analysis.The result shows that,the lithology of sandy lamination is mostly siltstone,argillaceous siltstone,and silty shale; the lamination mainly appears in the form of thin lamina,thin band,and thin interbed.And the existing sandy laminations have changed the way of lithological contact:denser development of the sandy lamination promotes more intense alternation of rock lithology,which is usually more favorable for hydrocarbon expulsion from source rocks.Besides,the sandy lamination favors pore size growth,so improving the physical property of the reservoir in turn.It changes the mechanical property of rocks,resulting in the change of distribution patterns of fractures.It also provides larger reservoir space for liquid hydrocarbon,dissolved gas,and free gas.Shale with highly developed sandy lamination in the Ordos Basin is the main target for present exploration and development,whereas thick deep-lacustrine shale,which is abundant in hydrocarbon,but due to limitations of present developing techniques,may only be producible in the future.

Key words: sandy lamination, hydrocarbon accumulation, exploration and development, Yanchang Formation, Ordos Basin

CLC Number:

TE122.1

Shi Liang, Wang Xiangzeng, Fan Bojiang, Lyu Lei, Li Yating, Yang Sen. Characteristics of sandy lamination and its hydrocarbon accumulation, Yanchang Formation,Ordos Basin[J]. Oil & Gas Geology, 2018, 39(3): 522-530.

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Characteristics of sandy lamination and its hydrocarbon accumulation, Yanchang Formation,Ordos Basin

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