Research on Oil Accumulation Process of Lithologic Reservoir in Chang 8 Member of Yanchang Formation, Xifeng Oilfield

Abstract

Abstract:

Using quantitative methods, the evolution process of formations, geothermal field, hydrocarbon generation and drainage, diagenesis, porosity, accumulation times, traps and the driving force window are simulated, and the space-time matching of key accumulation factors are further analyzed. Results show that beginning form the Early Cretaceous, the regional structural subsidence and incidental significant geothermal event triggered the generation and drainage of source rocks. Dissolution of organic acid before accumulation period dramatically improved the porosity of Chang 8 reservoir which provides enough space for oil accumulation. Following time-space evolution, the increasing pressure difference between source rocks and reservoirs makes the oil injected into reservoirs possible. Beginning at the accumulation period, the steady development of driving-force window and trap window not only promotes the efficiency of oil injection but also makes those already accumulated oil preserved safely. The time-space matching of key conditions of oil accumulation shows that oil accumulation in Xifeng oilfield is a natural process, namely, the porosity in Chang 8 reservoirs is perfect before the oil accumulation period, and after which, becomes denser and denser under compaction and cementation.

Key words: accumulation process, evolution of reservoir property, driving-force window, trap window, Xifeng oilfield

CLC Number:

TE122.3

LIU Zhen1,ZHU Wen-qi2,XIA Lu3,PAN Gao-feng1,WU Xun-da4,GUO Yan-ru1. Research on Oil Accumulation Process of Lithologic Reservoir in Chang 8 Member of Yanchang Formation, Xifeng Oilfield[J]. Geoscience, 2013, 27(4): 895-906.

References

[1]李庆忠.岩性油气藏地震勘探若干问题讨论(Ⅰ)［J］.岩性油气藏,2008, 20(2):2-6. [2]刘震,韩军,关强,等.地层岩性圈闭识别和评价的关键问题［J］.西安石油大学学报：自然科学版, 2007, 22(3):31-37. [3]赵孟军,宋岩,张水昌,等.油气成藏过程研究的地质意义［J］.天然气地球科学, 2006,16(5):545-551. [4]张厚福,张万选.石油地质学［M］.北京:石油工业出版社,1987：1-50. [5]姜振学,庞雄奇,黄志龙.叠合盆地油气运聚期次研究方法及应用［J］.石油勘探与开发,2000,27(4):22-25. [6]赵靖舟.油气成藏年代学研究进展及发展趋势［J］.地球科学进展,2002,17(3):378-383. [7]王飞宇,金之钧,吕修祥,等.含油气盆地成藏期分析理论和新方法［J］.地球科学进展,2002,17(5):754-762. [8]赵孟军,宋岩,潘文庆,等.沉积盆地油气成藏期研究及成藏过程综合分析方法［J］.地球科学进展,2004,19(6):939-946. [9]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,2005,7(1):34-44. [10]姚永朝,文志刚.西峰油田长8段油藏地质研究及储层评价［J］.江汉石油学院学报,2005,27(3):419-421. [11]张文正,杨华,李剑锋,等.论鄂尔多斯盆地长7段优质油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):298-302. [12]吉利明,吴涛,李林涛.鄂尔多斯盆地西峰地区延长组烃源岩干酪根地球化学特征［J］.石油勘探与开发,2007,34(4):424-428. [13]付金华,罗安湘,喻建,等.西峰油田成藏地质特征及勘探方向［J］.石油学报,2004,25(2):25-29. [14]段毅,张辉,吴保祥,等.鄂尔多斯盆地西峰油田原油含氮化合物分布特征与油气运移［J］.石油勘探与开发,2004,31(5):17-20. [15]任战利,赵重远,张军,等.鄂尔多斯盆地古地温研究［J］.沉积学报,1994,12(1):56-65. [16]孙少华,李小明,龚革联.鄂尔多斯盆地构造热事件研究［J］.科学通报,1997,42(3):306-309. [17]刘林玉,曹青,柳益群,等.白马南地区长8-1砂岩成岩作用及其对储层的影响［J］.地质学报,2006, 80(5):712-718. [18]薛永超,程林松.西峰油田长8油层组成岩储集相研究［J］.石油天然气学报,2010,32(6):6-10. [19]于波,崔智林,刘学刚,等.西峰油田长8储层砂岩成岩作用及对孔隙影响［J］.吉林大学学报：地球科学版,2008,38(3):405-409. [20]史基安,王金鹏,毛明陆,等.鄂尔多斯盆地西峰油田三叠系延长组长6-8段储层砂岩成岩作用研究［J］.沉积学报,2003,21(3):373-379. [21]应凤祥,罗平,何东博.中国含油气盆地碎屑岩储集层成岩作用与成岩数值模拟［M］.北京:石油工业出版社,2004：7-20. [22]潘高峰，刘震，赵舒,等. 砂岩孔隙度演化定量模拟方法——以鄂尔多斯盆地镇泾地区延长组为例［J］.石油学报,2011,32(2):249-256. [23]王学军.低渗透储层成因及石油运移聚集机理研究——以鄂尔多斯盆地镇北地区延长组为例［D］.北京:中国石油大学,2009. [24]潘高峰,刘震,赵舒,等.鄂尔多斯盆地镇泾地区长8段致密砂岩油藏成藏孔隙度下限研究［J］.现代地质, 2011,25(2):271-278. [25]付广,陈章明,姜振学.盖层物性封闭能力的研究方法［J］.中国海上油气(地质)，1995,9(2):83-88. [26]刘震,陈凯,朱文奇，等.鄂尔多斯盆地西峰地区长7段泥岩古压力恢复［J］.中国石油大学学报：自然科学版,2012,36(2):1-6. [27]邱楠生,张善文,金之钧.东营凹陷油气流体运移模式探讨——来自沸腾包裹体的证据［J］.石油实验地质,2001,23(4):403-407. [28]赵靖舟.油气包裹体在成藏年代学研究中的应用实例分析［J］.地质地球化学,2002,30(2):83-89. [29]王红军,蔡迎春.流体包裹体常规特征在油气成藏研究中的应用［J］.石油勘探与开发,2000,27(5):50-52. [30]柳少波,顾家裕.包裹体在石油地质研究中的应用与问题探讨［J］.石油与天然气地质,1997,18(4):326-331. [31]王传远,段毅,杜建国,等.鄂尔多斯盆地长9油层组流体包裹体特征与油气成藏期次分析［J］.地质科技情报, 2009,28(4):47-50. [32]刘建章,陈红汉,李剑,等.运用流体包裹体确定鄂尔多斯盆地上古生界油气成藏期次和时期［J］.地质科技情报,2005,24(4):60-66. [33]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,2002：20-70. [34]武明辉,张刘平,罗晓容,等.西峰油田延长组长8段储层流体作用期次分析［J］.石油与天然气地质,2006,27(1):33-36. [35]李士祥,邓秀芹,庞锦莲,等.鄂尔多斯盆地中生界油气成藏与构造运动的关系［J］.沉积学报,2010,28(4):798-805. [36]罗晓容,张刘平,杨华,等.鄂尔多斯盆地陇东地区长8-1段低渗油藏成藏过程［J］.石油与天然气地质,2010,31(6):770-778.