姬塬油田红井子地区延长组长9油层组石油富集规律

doi:10.11743/ogg20120513

Abstract

Abstract:

The paper summarized the hydrocarbon accumulation pattern in the formation based on analysis of logging and core data,relationship among lithology,physical property,electrical property and oil-bearing situation,as well as formation test and production test results from the Chang-9 reservoir in the Yanchang Formation of the Hongjingzi block in Jiyuan oilfield,Ordos Basin.It is suggested that the oil and gas generated in source rocks of the Chang-7 layer were mainly driven by the excess flow pressure inside and migrated to the Chang-9 reservoirs through pores and fractures.However,the hydrocarbon expulsion in Chang-7 was not strong enough to fully fill up the Chang-9 reservoirs.In addition the bottom water widely developed in the Chang-9 reservoirs impeded the further downward migration of hydrocarbons.The top barriers inside the Chang-9 provided the sealing conditions necessary for hydrocarbon accumulation in the reservoirs,resulting in the enrichment of some hydrocarbons in interlayers inside the Chang-9.Hydrocarbons might first accumulate in top layers of the Chang-9¹ where the physical properties were more favorable due to the dual control of lithology and physical properties.The relationship between structure features and formation testing as well as production testing results demonstrates that the structural relief has very little effect on oil and gas accumulations in the Chang-9 reservoirs.

Key words: barrier, source rock, hydrocarbon accumulation pattern, Yanchang Formation, Jiyuan oilfield, Ordos Basin

CLC Number:

TE122.3

Chen Zhaobing, Zhu Yushuang, Xie Hui, Zhang Jie, Wang Haihua, Cheng Gang, Xu Sen. Accumulation patterns of the Chang-9 oil reservoir in the Yanchang Formation of Hongjingzi area in Jiyuan oilfield[J]. Oil & Gas Geology, 2012, 33(5): 758-765.

References

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Accumulation patterns of the Chang-9 oil reservoir in the Yanchang Formation of Hongjingzi area in Jiyuan oilfield

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