鄂尔多斯盆地延长组长7油层组致密砂岩储层层理缝特征及成因

doi:10.11743/ogg20200315

Abstract

Abstract: The development degree and type of natural fractures are key to obtaining high and stable yield in tight sandstone reservoirs.Currently,tectonic fractures have been highlighted in exploration and development of tight sandstone reservoirs in the Yanchang Formation,Ordos Basin,whereas researches on bedding-parallel fractures are rarely seen.However,recent exploration and development practices indicate that bedding-parallel fractures widely developed in tight reservoirs have great effects on hydrocarbon accumulation.In this study,characteristics and genetic mechanism of bedding-parallel fractures in Chang 7 oil layer,Ordos Basin are intensively analyzed based on outcrop,core and thin section observation.The results indicate that the bedding-parallel fractures are commonly in low dip angles or sub-horizontal with small aperture.They are mostly discontinuous and short horizontally and isolated vertically,featuring strong heterogeneity in distribution,but can be cut by tectonic fractures.Oil immersion and stains are common within bedding-parallel fractures of drill cores.It is considered that the bedding-parallel fractures of high density in Chang 7 oil layer were generated in large scale since the Late Yanshanian Movement,and their distribution is jointly controlled by multiple geological factors,including fluid pressure,tectonic stress and dissolution.The accumulation effect of bedding-parallel fractures therein is of geological implication to tight oil exploration and development in the Ordos Basin.The differential development of bedding-parallel fractures is an important factor for the heterogeneity of tight oil distribution and large variability of single well productivity in the Ordos Basin.In all,regions of well-developed bedding-parallel fractures may be the "sweet spots" for tight oil exploration and development.

Key words: bedding-parallel fracture, Chang 7 oil layer, tight sandstone reservoir, Yanchang Formation, Ordos Basin

CLC Number:

TE122.2

Ju Wei, You Yuan, Feng Shengbin, Xu Haoran, Zhang Xiaoli, Wang Shengyu. Characteristics and genesis of bedding-parallel fractures in tight sandstone reservoirs of Chang 7 oil layer,Ordos Basin[J]. Oil & Gas Geology, 2020, 41(3): 596-605.

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Characteristics and genesis of bedding-parallel fractures in tight sandstone reservoirs of Chang 7 oil layer,Ordos Basin

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