苏北盆地复杂小断块油气成藏特征及地震识别技术

doi:10.11743/ogg20060614

Abstract

Abstract:

Subei basin is composed of small half grabens and features in closely-spaced faults,small traps,and homogeneous hydrocarbon abundance.Hydrocarbon pooling in Subei basin has the following characteristics:(1)The Late Eocene is the pooling period;(2)Hydrocarbon expulsion of source rocks is unilateral;(3)The migration and accumulation styles are different in the Eocene fault depression and the Palaeocene depression.The Eocene fault depression has small and isolated sandbodies,where hydrocarbons accumulate through vertical migration along the faults,the pools are distributed in the deep depression and occur vertically in multiple layers along the faults,and are dominated by structural-lithologic reservoirs.While the depression develops large delta sandbodies,hydrocarbon generation and accumulation occurring in the same layer and hydrocarbon migration is active.The pools mainly occur in the slope and uplift zones and are dominated by structural reservoirs.(4)Hydrocarbon enrichment is mainly controlled by source rock maturity,physical properties of sandbodies and sealing of the faults.The upper source-reservoir-cap rock combination is controlled by hydrocarbon migration,and the middle and lower combinations are controlled by the development of carrier beds and traps.To deal with the exploration of small complex fault block reservoirs,a set of technologies concerning seismic acquisition,processing,and interpretation,have been developed and improved.

Key words: fault sealing capability, oil and gas migration, oil and gas pool, exploration technology, small complex fault block, half graben, Subei basin

CLC Number:

TE112.3

Mao Fengming, Chen Anding, Liu Yurui, Yan Yuanfeng, Ye Saodong, Liu Qidong, Chen Liqiong, Tan Yan. Hydrocarbon pooling features and seismic recognizing technologies of small complex fault blocks in Subei basin[J]. Oil & Gas Geology, 2006, 27(6): 827-840.

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Hydrocarbon pooling features and seismic recognizing technologies of small complex fault blocks in Subei basin

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