Controlling factors and hydrocarbon accumulation pattern of Chang 4+5 oil reservoirs in Jiyuan area, Ordos Basin

Abstract

Abstract: Chang 4+5 oil reservoirs in Jiyuan area, the Ordos Basin, are characterized by low permeability, complicated oil-water relationship and greatly different oil-bearing potentials in and between layers, in addition to extensive development. Moreover, factors affecting oil and water distribution in the reservoirs need to be further ascertained. The analysis on the controlling factors of hydrocarbon accumulation shows that the large-scale extensive development of Chang 4+5 oil reservoirs are controlled by three factors. First, the widespread Chang 7 source rocks provide abundant resource base. Second, high porosity and high permeability reservoirs of delta front facies controlled by differential diagenesis act as the places for oil and gas accumulation. And third, a great number of fractures are important oil migration pathways. Locally, however, affected by source rock thickness, fracture development degree and reservoir heterogeneity, oil enrichment degrees are different. In this paper, a hydrocarbon accumulation pattern was innovatively proposed with Chang 7 Member as the oil source, oil migrating along fractures and permeable sandstones pathways, non-isokinetic multi-point charging vertically, and physical properties controlling heterogeneous reservoir formation. Based on this pattern, the reasons for the extensive development and different oil-bearing potentials of Chang 4+5 oil reservoirs are revealed geologically.

Key words: source rocks, reservoir physical properties, oil charging force, controlling factors of hydrocarbon accumulation, Chang 4+5 oil reservoirs, Ordos Basin

Li Cheng, Dan Weidong, Yuan Jingsu, Xin Honggang, Zhang San, Ma Yanli. Controlling factors and hydrocarbon accumulation pattern of Chang 4+5 oil reservoirs in Jiyuan area, Ordos Basin[J]. China Petroleum Exploration, 2016, 21(2): 45-52.

References

[1] 杨俊杰. 鄂尔多斯盆地构造演化与油气分布规律[M]．北京：石油工业出版社，2002.Yang Junjie. Tectonic evolution and oil & gas reservoir distribution in Ordos Basin[M]. Beijing: Petroleum Industry Press，2002.
[2] 付金华，喻建，徐黎明，等. 鄂尔多斯盆地致密油勘探开发新进展及规模富集开发主控因素[J]. 中国石油勘探，2015,20(5):9-19.Fu Jinhua, Xu Jian, Xu Liming, et al , New progress in exploration and development of tight oil in Ordos Basin and main controlling factors of largescale enrichment and exploitable capacity[J]. China Petroleum Exploration, 2015,20(5):9-19.
[3] 曾少华. 陕北三叠系延长统湖盆三角洲沉积模式的建立[J]. 石油与天然气地质，1992,13(2):229-235.Zeng Shaohua. Establishment of lake delta sedimentary model from Yanchang series in north Shanxi[J]. Oil ﹠ Gas Geology,1992,13(2):229-235.
[4] 邹才能, 赵文智, 张兴阳, 等. 大型敞流坳陷湖盆浅水三角洲与湖盆中心砂体的形成与分布[J]. 地质学报，2008,82(6):813-825. Zou Caineng, Zhao Wenzhi, Zhang Xingyang, et al . Formation and distribution of shallow-water deltas and centralbasin sandbodies in large open depression lake basins[J]. Acta Geologica Sinica, 2008,82(6):813-825.
[5] 薛永超，田虓丰. 鄂尔多斯盆地7 致密油藏特点[J]. 特种油气藏，2014,21(3):111-115.Xue Yongchao, Tian Xiaofeng. Characteristics of Chang-7 tight oil reservoir, Ordos Basin[J]. Special Oil & Gas Reservoirs, 2014,21(3):111-115.
[6] 蔺宏斌, 侯明才, 陈洪德, 等. 鄂尔多斯盆地上三叠统延长组沉积体系特征及演化[J]. 成都理工大学学报: 自然科学版，2008,35(6):674-680.L i n H o n g b i n , H o u M i n g c a i , C h e n H o n g d e , e t a l .Characteristics and evolution of the sedimentary system of Upper Triassic Yanchang Formation in Ordos Basin, China[J].Journal of Chendu university of technology: Science & Technology Edition, 2008,35(6):674-680.
[7] 付金华, 郭正权, 邓秀芹. 鄂尔多斯盆地西南地区上三叠统延长组沉积相及石油地质意义[J]. 古地理学报，2005,1(7):34-44.Fu Jinhua, Guo Zhengquan, Deng Xiuqin. Sedimentary facies of the Yanchang Formation of Upper Triassic and petroleum geological implication in southwestern Ordos Basin[J]. Journal of Palaeogeography，2005,1(7):34-44.
[8] 邓秀芹, 付金华, 姚泾利, 等. 鄂尔多斯盆地中及上三叠统延长组沉积相与油气勘探的突破[J]. 古地理学报，2011,4(13):443-455.Deng Xiuqin, Fu Jinhua, Yao Jingli, et al . Sedimentary facies of the Middle-Upper Triassic Yanchang Formation in Ordos Basin and breakthrough in petroleum exploration[J].Journal of Palaeogeography, 2011,4(13):443-455.
[9] 高永利, 王勇, 孙卫. 姬塬地区长4+5 低渗储层成岩作用与孔隙演化[J]. 特种油气藏，2014,21(1):68-72. Gao Yongli, Wang Yong, Sun Wei. Diagenesis and pore evolution process of Chang4+5 low permeability reservoir in Jiyuan area[J]. Special Oil and Gas Reservoirs，2014,21(1):68-72.
[10] 蒋有录. 石油天然气地质与勘探[M]. 北京: 石油工业出版社，2006. Jiang Youlu. OiL & gas geology and exploration[M]. Beijing: Petroleum Industry Press，2006.
[11] 杨华, 张文正. 论鄂尔多斯盆地长7 段优质烃源岩在低渗透油气成藏富集中的主导作用：地质地球化学特征[J]. 地球化学，2005,34(2):147-154.Yang Hua, Zhang Wenzheng. Leading effect of the Seventh Member high-quality source rock of Yanchang Formation in Ordos Basin during the enrichment of low-penetrating oilgas accumulation: geology and geochemistry[J]. Geochimica，2005,34(2):147-154.
[12] 张文正, 杨华, 李剑锋, 等. 论鄂尔多斯盆地长7 段优质烃源岩在低渗透油气成藏富集中的主导作用——强生排烃特征及机理分析[J]. 石油勘探与开发，2006,33(3):289-293.Zhang Wenzheng, Yang Hua, Li Jianfeng, et al . Leading effect of high-class source rock of Chang7 in Ordos Basin on enrichment of low permeability oil-gas accumulationhydrocarbon generation and expulsion mechanism[J]. Petroleum Exploration and Development，2006,33(3):289-293.
[13] 窦伟坦, 侯明才, 陈洪德, 等. 鄂尔多斯盆地三叠系延长组油气成藏条件及主控因素研究[J]. 成都理工大学学报: 自然科学版，2008,35(6):686-692. Dou Weitan, Hou Mingcai, Chen Hongde, et al . A research on the conditions of the reservoir formation and the main controlling factors of Upper Triassic Yanchang Formation in Ordos Basin, China[J]. Journal of Chendu university of technology: Science & Technology Edition，2008,35(6):686-692.

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