杏北西斜坡区扶杨油层断裂系统特征  

Fault system characteristics of Fuyu—Yangdachengzi oil layer in the west slope of the northern Xingshugang oil field

作　　者：王雅春[1,2] 朱琳[1,2] 王璐[1,2] 孙永河[1,2] 席国兴[3] 

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]东北石油大学地球科学学院'非常规油气成藏与开发'省部共建国家重点实验室培育基地,黑龙江大庆163318 [3]大庆油田有限责任公司第四采油厂,黑龙江大庆163511

出　　处：《中南大学学报（自然科学版）》2015年第3期997-1005,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41440017);黑龙江省自然科学基金资助项目(D201406)~~

摘　　要：为了找出与杏北西斜坡区扶杨油层控油关系密切的断裂,在分析断裂形成的区域构造背景基础上,系统地研究了断裂的几何学特征及形成演化过程,并依据断裂的变形期次、变形性质划分了断裂系统,通过界定扶杨油层断裂系统的构成厘定了控油断裂类型及分布规律。研究结果表明：杏北西斜坡区断裂以平直断层为主,倾角陡、规模小,断层走向总体为北西向。断裂演化主要经历3期不同性质的变形：即青山口组沉积时期（Ⅰ期）的拉张变形、嫩一二段沉积时期（Ⅱ期）持续拉张变形和嫩三段~第四系时期（Ⅲ期）的反转变形。其中青山口组沉积过程中断裂活动最为强烈,致使断裂集中发育在T2y1和T2 2个界面,并形成了高密度的T2反射层（扶杨油层的顶面）断裂密集带。按照断裂不同时期的不同性质变形特征可将杏北西斜坡区划分出5套断裂系统,T2反射层主要发育Ⅰ型断裂系统、Ⅰ-Ⅱ型断裂系统和Ⅰ-Ⅱ-Ⅲ型断裂系统,其中沟通青山口组源岩和扶杨油层且未断穿青山口组泥岩盖层的I型断裂系统的断裂密集带边部具有较好的油气富集。To find out the oil-controlling faults in close relationship with Fuyu--Yangdachengzi oil layer in the west slope of the northern Xingshugang oil field, on the basis of analysing regional tectonic setting of fault formation, geometry characteristics and evolution of fault were studied, fault system was divided depending on phases of deformation and deformation properties, and type of oil-controlling faults and their distribution were determined by defining fault system of Fuyu--Yangdachengzi oil layer. The result shows that the faults are dominated by straight fractures which dip steeply and the faults strike in NW with the small fractures. Fault evolution [nainiy experienced 3 different deformations： extensional deformation during the sedimentation of the Qingshankou formation （ Ⅰ ）, sustainable extensional deformation during the sedimentation of K1n2 and K1n2 （Ⅱ）, and reversal deformation during the sedimentation of the Kln3-the quaternary period（Ⅲ）. The fractures had an intense activity during the sedimentation of the Qingshankou formation, thus faults were concentrated development in T2yl and T2 reflecting layers, forming the high density fault condensed belts （the top surface of Fuyu--Yangdachengzi oil layer） of T2 reflecting layer, oil mainly distributed in the edge of the fault condensed belts. According to the three stages of fault deformation, the west slope of the northern Xingshugang oil field was divided into five fault systems, and the T2 reflecting layer mainly had the Ⅰ type fault system, theⅠ - Ⅱ type fault system and the Ⅰ - Ⅱ -Ⅲ type fault system. The oil had good enrichment around the Ⅰ type fault system in the study area which connected the Qingshankou formation source rocks and the Fuyu-- Yangdachengzi oil layer.

关 键 词：杏北西斜坡 扶杨油层 断裂密集带 断裂演化 断裂系统 

分 类 号：TE111.2[石油与天然气工程—油气勘探]