准噶尔盆地滴南凸起侵入岩发育特征及储层主控因素——以滴西185井区下石炭统松喀尔苏组为例  

Development characteristics of intrusive rocks and main controlling factors of reservoir in Dinan Uplift of the Junggar Basin:taking the Lower Carboniferous Songkalsu Formation in the Dixi 185 Well Area as an example

作　　者：丁艳雪 石新朴[1] 贺陆军[1] 侯玉峰 刘泽民[1] 王冶 DING Yanxue;SHI Xinpu;HE Lujun;HOU Yufeng;LIU Zemin;WANG Ye(First Gas Production Plant of Xinjiang Oilfield Company,CNPC,Karamay,Xinjiang 834000,China;Beijing ZDAR Petroleum Technology Company Limited,Beijing 100085,China)

机构地区：[1]中国石油新疆油田分公司采气一厂,新疆克拉玛依834000 [2]北京中达奥瑞石油科技有限公司,北京100085

出　　处：《东北石油大学学报》2023年第5期17-35,I0002,I0003,共21页Journal of Northeast Petroleum University

基　　金：中国石油重大科技专项(2017E-0410)。

摘　　要：准噶尔盆地滴南凸起具有较好的油气显示和油气勘探潜力。以滴西185井区下石炭统松喀尔苏组侵入岩为研究对象,采用岩心观察、镜下鉴定和常规物性分析,结合钻、测井和地震资料,分析侵入岩岩性、分布特征及储层主控因素。结果表明:研究区下石炭统松喀尔苏组侵入岩主要为花岗斑岩与闪长玢岩,闪长玢岩分布于滴西181井南断裂上盘,厚度随侵入距离的增大而减小,花岗斑岩分布不受滴西181井南断裂控制;花岗斑岩储集空间以次生溶蚀孔和微裂缝为主,闪长玢岩储集空间主要为次生溶蚀微孔。闪长玢岩和花岗斑岩侵入体有利储层的发育受侵入相、矿物组分、溶蚀作用、侵入时间和岩浆性质等因素控制,油气往往趋向在侵入体上部边缘亚相带或与围岩接触带相带附近富集成藏。花岗斑岩暗色矿物质量分数明显较闪长玢岩的少,造缝能力强,长石斑晶和基质质量分数明显较闪长玢岩的高,次生溶蚀孔隙面孔率占比大,各类次生孔隙组合与构造微裂缝沟通并成为有利储层。后期岩浆侵入使气水溶液和热液等流体沿早期原生孔隙和次生孔缝渗透,发生溶蚀和热液充填等作用,溶蚀作用可提高侵入岩储层的孔隙度和渗透率,改善早期侵入岩储层的品质;热液充填作用在一定程度上减少原生孔隙度,降低早期侵入岩储层的品质。岩浆性质直接影响岩浆沿断裂和次级断裂系统侵入围岩的距离,制约储层发育规模。该结果为类似侵入岩区油气储层成因研究及勘探开发提供借鉴。Dinan Uplift in the Junggar Basin has good oil and gas display and exploration potential.Taking the Lower Carboniferous Songkalsu Formation intrusive rocks in the Dixi 185 Well Area as the research object,using core observation,microscopic identification,and conventional physical property analysis,combining with drilling and seismic data,the lithology and distribution characteristics of intrusive rocks,and the main controlling factors for reservoir development are analyzed.The results indicate that the intrusive rocks of the Lower Carboniferous Songkalsu Formation in the study area are mainly granite porphyry and diorite porphyry.Diorite porphyry is distributed on the hanging wall of the Dixi 181 Well South Fault,and its thickness decreases with the increase of intrusion distance.The distribution of granite porphyry is not controlled by the Dixi 181 Well South Fault.The storage space of granite porphyry is mainly composed of secondary dissolution pores and microcracks,while the storage space of diorite porphyry is mainly composed of secondary dissolution micropores.The development of favorable reservoirs in diorite porphyry and granite porphyry intrusions is controlled by multiple factors such as intrusive facies zones,mineral components,dissolution,invasion time,and magmatic properties.Oil and gas often tend to accumulate and form reservoirs near the upper edge subfacies zone of the intrusion or the contact zone with the surrounding rock.Granite porphyry has a significantly lower content of dark minerals compared to diorite porphyry,and has a strong ability to form fractures.However,the content of feldspar porphyry crystals and matrix is significantly higher than diorite porphyry,and the proportion of secondary dissolution pore faces is large.Various secondary pore combinations and structural microfractures communicate to form favorable reservoirs.The intrusion of magma in the later stage causes fluids such as gas-water solutions and hydrothermal fluids to penetrate along the early primary pores and secondary po

关 键 词：滴南凸起 滴西185井区 石炭统 松喀尔苏组 侵入岩 花岗斑岩 闪长玢岩 发育特征 储层主控因素 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]