摘要
根据测录井、试油等资料,利用断面正压力法对伊通盆地岔路河断陷古近系控藏断层的垂向封闭性进行了研究。研究结果表明:(1)通过油气藏的埋藏深度、上覆地层平均密度、断层倾角等数据可计算出油气藏的现今断面正压力。伊通盆地岔路河断陷古近系油气藏的现今断面正压力值为13.3~56.0 MPa,成藏期断面正压力值为3.8~13.1 MPa,表现为“古开启-今封闭”的特征,因断层面所受压力越大,断层越紧闭,从而形成垂向封闭,反之则开启。(2)将研究区已知油气藏现今断面正压力值的最小值13.3 MPa定义为岔路河断陷垂向封闭的临界值,并进一步确定了控藏断层现今临界埋藏深度为2262 m。(3)断面正压力与断层紧闭指数呈正相关关系,控藏断层的垂向封闭临界压力值、临界埋藏深度和断层紧闭指数等参数可定量评价研究区控藏断层封闭性。(4)断层既可作为油气运移通道,又可为油气藏的形成提供遮挡作用。岔路河断陷西北缘C43油气藏的控藏断层在成藏期表现为垂向开启,与油气大量生排烃时期相吻合,具有沟通油源、运移油气的作用;C43—C48井区的控藏断层现今处于垂向封闭状态,可有效封堵油气。
Based on the data of logging and oil test,the vertical sealing of Paleogene faults controlling reservoir in Chaluhe fault depression of Yitong Basin was evaluated by using the method of normal pressure of fault plane.The results show that:(1)The present normal pressure of fault plane of oil and gas reservoirs can be calculated by the data of burial depth,average density of overlying strata and fault dip angle.In the Paleogene,the present normal pressure of Paleogene reservoirs in Chaluhe fault depression of Yitong Basin ranges from 13.3 MPa to56.0 MPa,and the normal pressure during the reservoir forming period was 3.8-13.1 MPa,showing the characteristics of“ancient opening and present closing”.As the greater the pressure on the fault plane,the tighter the fault,thus forming a vertical seal,otherwise open.(2)The minimum value of present normal pressure of fault plane of the reservoirs in the study area is 13.3 MPa,which is defined as the critical value of the vertical sealing of Chaluhe fault depression,and the present critical burial depth of the faults controlling reservoir is further determined to be 2262 m.(3)The normal pressure of fault plane is positively correlated with the fault tightness index,the vertical sealing critical pressure value,critical burial depth and fault tightness index can be used to quantitatively evaluate the sealing ability of the faults controlling reservoir in the study area.(4)The fault can not only serve as the hydrocarbon migration pathway,but also provide shelter for the formation of reservoirs.The faults controlling reservoir of C43 reservoir in the northwestern margin of Chaluhe fault depression showed a vertical opening during the accumulation period,which coincided with the period of hydrocarbon generation and expulsion,with the function of connecting oil sources and migrating oil and gas.The faults controlling reservoir in well region C43-C48 are now in a vertical sealing state,which can effectively seal oil and gas.
作者
应凯莹
蔡长娥
梁煜琦
陈鸿
尚文亮
苏桂娇
YING Kaiying;CAI Chang’e;LIANG Yuqi;CHEN Hong;SHANGWenliang;SU Guijiao(Chongqing Key Laborotary of Complex Oil and Gas Field Exploration and Development,Chongqing University of Science&Technology,Chongqing 401331,China;School of Petroleum Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)
出处
《岩性油气藏》
CAS
CSCD
北大核心
2023年第2期136-143,共8页
Lithologic Reservoirs
基金
国家自然科学基金项目“自然演化碎屑锆石裂变径迹的初始径迹长度及径迹长度的影响因素探究”(编号:41802154)
重庆科技学院大学生科技创新训练计划项目“渤海湾盆地纯化地区沙四段断层封闭性定量研究”(编号:2021142)联合资助。
关键词
断层封闭性
断面正压力
垂向封闭性
临界压力
临界埋藏深度
古近系
岔路河断陷
伊通盆地
fault sealing ability
normal pressure of fault plane
vertical sealing ability
critical pressure
critical burial depth
Paleogene
Chaluhe fault depression
Yitong Basin
作者简介
第一作者:应凯莹(2001—),女,重庆科技学院在读本科生,研究方向为地质学。地址:(401331)重庆市沙坪坝区大学城东路20号重庆科技学院。Email:kaiyingy@163.com;通信作者:蔡长娥(1986—),女,博士,讲师,硕士生导师,主要从事低温热年代学与石油地质学方面的教学与研究工作。Email:ccecai@163.com。
