摘要
塔南凹陷是海塔盆地重要的富油凹陷之一,目前发现的油藏大多受断裂所控制.为了探究塔南凹陷断裂要素对油藏的控制作用,本研究基于地震、钻井、试油等资料,通过对已发现的191个断控油藏进行精细解剖,开展了断裂特征分析,明确了断裂控藏的关键要素,建立了断裂控藏模式.结果表明:塔南凹陷断裂要素不同程度地影响着断裂圈闭的有效性,其本质在于影响着断裂的封堵性能,其中产状、活动速率、类型是影响断裂封堵性及控制油藏形成的关键要素.塔南凹陷利于油藏形成的断裂特征为:走向NE向,倾角55°~85°,断距10~150 m,活动速率<20 m/Ma,泥岩削刮比SGR>0.35、泥质含量R_(m)>0.30,组合样式呈斜交式和垒堑式,并且以二、三级断裂组合为主.塔南凹陷主要存在3种断裂控藏模式:早期伸展断裂和早期伸展中期张扭断裂控制的源下侧向输导断裂遮挡原生油藏控藏模式、源内垂向输导断裂遮挡原生油藏控藏模式,以及长期继承性断裂控制的源上垂向输导断裂遮挡次生油藏控藏模式.研究成果可为塔南凹陷断裂相关圈闭的精细评价和勘探部署提供理论指导.
Tanan sag is one of the important oil-rich sags in Haita Basin,and most of the discovered oil reservoirs are controlled by faults.In order to explore the controlling effect of fault elements on oil reservoirs in Tanan sag,a fine dissection was conducted on 191 discovered fault-controlled reservoirs based on the data of seismic,drilling and oil testing.The fault characteristics were analyzed,the key elements of fault-controlled reservoirs were defined,and the fault-controlled reservoirs model was established.The results show that the effectiveness of fault traps in Tanan sag is affected by fault elements to varying degrees,and its essence is to affect the fault sealing.Among them,occurrence,activity rate and type are the key elements that affect fault sealing and control reservoir formation.The fault characteristics favorable for reservoir formation in Tanan sag are as follows:strike NE,dip angle 55°—85°,fault distance 10—150 m,activity rate < 20 m/Ma,SGR>0.35,R_m>0.30,and combination styles of oblique and horst-graben,which are dominated by the combination of secondary and tertiary faults.There are three fault-controlled reservoir modes in Tanan sag:the first is that the primary reservoir mode of sub-source lateral transport fault blocking,the second is that the primary reservoir mode of inner-source vertical transport fault blocking,and these two modes are controlled by early extensional faults and early extension and middle tension-torsion faults.The third is that the secondary reservoir mode of above-source vertical transport fault blocking,which is controlled by long-term inherited faults.This research provides theoretical guidance for fine evaluation and exploration deployment of fault-related traps in Tanan sag.
作者
高长海
姜洪福
冯建伟
辛世伟
许艳龙
王建
GAO Changhai;JIANG Hongfu;FENG Jianwei;XIN Shiwei;XU Yanlong;WANG Jian(National Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Shandong Provincial Key Laboratory of Reservoir Geology,China University of Petroleum(East China),Qingdao,Shandong 266580,China;PetroChina Daqing Tamsag,LLC.,Daqing,Heilongjiang 163712,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2024年第2期364-376,共13页
Journal of China University of Mining & Technology
基金
山东省自然科学基金项目(ZR2021MD077)
国家科技重大专项(2017ZX05001-001-006)。
关键词
断裂特征
油藏
主控要素
塔南凹陷
海塔盆地
fault characteristic
oil reservoir
main controlling element
Tanan sag
Haita Basin
