渤中凹陷断裂体系及其对成藏的控制

发布时间：2018-02-03 05:09

本文关键词： 断裂体系输导体系油气藏控制规律　出处：《中国石油大学(华东)》2015年硕士论文　论文类型：学位论文

【摘要】：渤中凹陷位于渤海湾盆地中部,面积广,油气资源丰富,但勘探程度低,故而通过本次研究,明确渤中凹陷断裂体系特征,确定油气运移输导体系,总结渤中凹陷断裂对油气成藏的控制规律,为渤中凹陷油气进一步勘探打下基础。本文对渤中凹陷断裂基本特征进行了详细讨论;对渤中凹陷油气输导体系进行了分析研究;精细解剖了已发现的油气藏,确定了油气成藏的有利因素,在此基础上,归纳总结出断裂对油气成藏的控制规律。本文通过地震手段,提取相干体,综合地震剖面对渤中凹陷不同时期断裂体系进行了详细刻画。古近系受伸展作用,断裂具拉张性质;新近系受郯庐断裂右旋活动影响,断裂具一定的剪切性质。由深及浅断裂由单一的主断裂演化为断裂带或断裂组合,向上撒开呈枝状展布,断裂规模逐渐减小,级别降低,连续性变差,组合样式由斜交式、平行式等演化为雁列式、帚状等。本文通过地震剖面统计同沉积断层两盘厚度差,计算断层活动速率,以此反映断层活动性。渤中凹陷各时期断层活动强度呈“M+翘尾”形态。依据区域构造运动、断层切穿地层、断裂活动性和油气成藏期综合研究,渤中地区断裂活动时期为沙三段、东三段、东二段、馆陶组和明化镇组沉积时期。对渤中地区已有的油气藏进行解剖分析,反推油气运移方式,研究区油气输导体系分为三类:断层输导体系、阶梯状断层—砂体输导体系和不整合—断层—砂体输导体系。论文精细研究渤中地区237个油气藏,统计其相关影响因素,总结了断裂对油气成藏的控制规律:主断裂沟通油源,垂向输导油气;浅层次级断裂再次分配油气,扩大油气分布范围,并形成了大量构造圈闭;主次断裂相互耦合构成了良好的枝状输导体系。次级断裂同向输导,反向遮挡;断层活动速率在0-30m/Ma,SGR0.3、Rm0.35,组合样式为斜交式、雁列式、Y字形、似花状和阶梯状的断裂成藏条件好。平面上断裂相交处、凹形处和走滑断裂增压段,断裂遮挡条件好,对油气聚集成藏有利。断层封闭性是油气成藏的主要影响因素,其次是输导体系,断层活动速率、断裂类型和断层遮挡类型次之。
[Abstract]:Bozhong sag is located in the middle of the Bohai Bay basin with a wide area and rich oil and gas resources, but the exploration degree is low. Therefore, through this study, the characteristics of the fault system in the Bozhong sag are clarified, and the oil and gas migration and transportation system is determined. This paper summarizes the rules of controlling oil and gas accumulation by faults in Bozhong Sag, and lays a foundation for further exploration of oil and gas in Bozhong Sag. The basic characteristics of faults in Bozhong Sag are discussed in detail in this paper. The oil and gas transportation system in Bozhong sag is analyzed and studied. The discovered oil and gas reservoirs are carefully dissected, and the favorable factors for oil and gas accumulation are determined. On this basis, the control law of fault on oil and gas reservoir formation is summarized. In this paper, coherent bodies are extracted by seismic means. The fault system in different periods of Bozhong sag is described in detail by comprehensive seismic section. The Paleogene system is extensional and the fault is extensional; The Neogene is affected by the right-lateral activity of the Tanlu fault, and the fault has a certain shear property. The deep and shallow faults evolved from a single main fault to a fault zone or fault assemblage with a branch spreading upward, and the scale of the fault gradually decreased. The grade is reduced, the continuity is bad, the combination style is changed from oblique type, parallel type and so on to geese, broom, etc. In this paper, the thickness difference of the two plates of the same sedimentary fault is counted by seismic profile, and the rate of fault activity is calculated. According to the regional tectonic movement, fault cutting strata, fault activity and oil and gas reservoir forming period, the comprehensive study of fault activity in Bozhong sag is based on the regional tectonic movement, fault cut through strata, fault activity and hydrocarbon accumulation period. The active period of fault in Bozhong area is the sedimentary period of the third member of Sha, the third member of east part, the second member of east part, the Guantao formation and the Minghuazhen formation. The oil and gas reservoirs in Bozhong area have been dissected and analyzed, and the migration patterns of oil and gas have been pushed back. There are three types of oil and gas transport systems in the study area: fault transport system, ladder fault-sand body transport system and unconformity fault-sand body transport system. The related influencing factors are analyzed and the rules of controlling oil and gas accumulation by fault are summarized: the main fault communicates oil source and vertical transporting oil and gas; The shallow fault redistributes oil and gas, expands the distribution range of oil and gas, and forms a large number of structural traps. The primary and secondary faults are coupled to each other to form a good branch-like transport system. The fault activity rate ranges from 0 to 30 m / m Mai SGR 0.3% Rm 0.35, and the combination pattern is oblique and Y-shaped. The reservoir forming conditions of flower-like and ladder-like faults are good. At the intersecting of the faults on the plane, at the concave and strike-slip faults, the conditions of fault occlusion are good. Fault sealing is the main influencing factor of oil and gas accumulation, followed by transportation system, fault activity rate, fault type and fault occlusion type.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【相似文献】