过盖层断裂的垂向封闭性预测方法及其在冀中坳陷中的应用  

Hydrocarbon Upward Uigration Condition in Different Directions and Prediction Method of Distribution Area

作　　者：胡春明[1] 付广[1] 展铭望[1] 

机构地区：[1]东北石油大学,黑龙江大庆163318

出　　处：《地质论评》2018年第1期227-236,共10页Geological Review

基　　金：国家自然基金资助项目"深成油气藏盖层封闭能力动态演化过程及完整性定量评价"(编号:U1562214)的成果~~

摘　　要：为了研究含油气盆地断裂发育区油气纵向分布规律,在不同方向运移油气过盖层断裂的垂向封闭机制研究的基础上,通过比较泥岩盖层断接厚度与其油源断裂或输导断裂在泥岩盖层内分段生长连接所需的最大断接厚度的相对大小,建立了一套不同方向运移油气过盖层断裂垂向封闭性的预测方法,并将其分别应用于渤海湾盆地冀中凹陷留楚地区东二、三段垂向运移油气过东一、二段泥岩盖层断裂垂向封闭性和文安斜坡沙二段侧向运移油气过沙一段底部泥岩盖层断裂垂向封闭性的预测中,结果表明:留楚地区东二、三段垂向运移油气过东一、二段泥岩盖层断裂垂向不封闭区主要分布在北部留楚背斜核部局部地区和西南广大地区,其余地区为过盖层断裂垂向封闭区。文安斜坡沙二段侧向运移油气过沙一段底部泥岩盖层断裂垂向不封闭区主要分布在东部和中部地区,其余地区为过盖层断裂垂向封闭区。与目前留楚地区东一段、馆陶组和文安斜坡区沙一段已发现油气分布相吻合,表明该方法用于预测不同方向运移油气过盖层断裂的垂向封闭性是可行的。Objectives： In order to study the vertical distribution of oil and gas in fracture development area of petroliferous basin. Methods： on the basis of the study of vertical sealing mechanism of the migration of oil and gas over fault in different directions, by comparing the relative thickness between the fault thickness of mudstone cap rock and the maximum fracture thickness required by the oil source fault or the fracture of the transporting fault in the mudstone cap formation, a set of prediction methods for vertical sealing of fractured hydrocarbon migration in different directions has been established. They are applied to vertical migration of oil and gas in the Ed2 and Ed3 section of Jizhong depression in Jizhong sag and vertical sealing of the fault of the mudstone in Ed1 and Ed2 of the Bohai formation and prediction of vertical sealing of bottom mudstone caprock fracture in Es2 of Shahejie Formation in Wen an slope. Results ： The results distributed in the northern show that the vertical non closure area of the mudstone caprock in LiuChu area is mainly part of the hang anticline core area and the vast southwest area, while the remaining area is the vertical sealing area of the cover fault.The vertical non mainly distributed in the eastern and central parts, while the closed area of mudstone cap rock in Wen＇an slope is Conclusions： The oil and gas distribution has been found consistent with the first member of Shahejie formation, the Guantao formation and the I st member of Shahejie Formation in Wen＇an slope area. It is proved that the method is feasible for predicting vertical sealing of faults in different directions of migration oil and gas caprock.

关 键 词：不同方向 过盖层 断裂 垂向封闭性 预测方法 

分 类 号：P618.13[天文地球—矿床学]