断层圈闭封闭性综合判别方法及其应用  

Comprehensive judging method for the sealing of the fault trap and its application

作　　者：李如一[1] LI Ruyi(Exploration and Development Research Institute of Daqing Oilfield Co Ltd., Daqing 163712, China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院

出　　处：《大庆石油地质与开发》2019年第4期1-6,共6页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“典型大型气田(藏)盖层封闭性动态定量评价”(2016ZX05007003003)

摘　　要：为了研究含油气盆地断裂发育区油气分布规律,在断层圈闭封闭(侧向和垂向同时封闭)及其影响因素研究的基础上,通过比较断层圈闭遮挡断层岩的泥质体积分数和断层侧向封油气所需最小的断层岩泥质体积分数的相对大小,以及断层圈闭的盖层断接厚度和垂向封闭所需最小盖层断接厚度的相对大小,建立了一套断层圈闭封闭性综合判别方法,并将其应用于渤海湾盆地冀中坳陷霸县凹陷议论堡地区沙二段断层圈闭封闭性的综合判别中。结果表明:议论堡地区沙二段断层圈闭封闭区主要分布在王仙庄断层中部和北部、梁召断层南部和马西断层中部,该断层圈闭封闭区有利于沙二段油气聚集与保存。研究结果与目前议论堡地区沙二段已发现的油气分布情况相吻合,表明用该方法综合判别断层圈闭封闭性是可行的。In order to study the distribution of the oil and gas in the fracture developed zone of oil-bearing basins, based on the researches on the fault trap closures (lateral and vertical closures at the same time) and their influencing factors, a set of the comprehensive judging methods of the fault trap sealing were established by comparing the relative shale contents in the fault-trap barrier fault rock and required minimal one by the fault lateral sealing and moreover the relative thicknesses of both the caprock connected one of the fault trap and the minimal caprock connected one required for the vertical closure. And furthermore the method was applied in the comprehensive judgement of the fault trap sealing in Member Es2 of Yilunpu area in Baxian Sag of Jizhong Depression in Bohai Bay Basin. The result shows that the closed regions by Member Es2 fault trap in Yilunpu area are mainly distributed in the central and northern parts of Wangxianzhuang Fault, the southern part of Liangzhao Fault and the middle part of Maxi Fault, which are beneficial to the oil and gas accumulation and preservation. The study results are coincident with the hydrocarbon distribution discovered in Member Es2 in Yilunpu area, which show that this method is feasible for the comprehensive judgement of the fault-trap sealings.

关 键 词：断层圈闭 侧向封闭性 垂向封闭性 综合判别方法 渤海湾盆地 霸县凹陷 

分 类 号：TE122.3[石油与天然气工程—油气勘探]