| 克拉通盆地构造转折区中-新生界构造特征及其控藏意义——以鄂尔多斯盆地西南部镇泾地区延长组为例 |
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| 引用本文： | 张园园,任战利,何发岐,崔军平,杨桂林,王琨,吉园园.克拉通盆地构造转折区中-新生界构造特征及其控藏意义——以鄂尔多斯盆地西南部镇泾地区延长组为例[J].岩石学报,2020,36(11):3537-3549. |
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| 作者姓名： | 张园园 任战利 何发岐 崔军平 杨桂林 王琨 吉园园 |
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| 作者单位： | 大陆动力学国家重点实验室, 西安 710069;西北大学地质学系, 西安 710069;中国石化华北油气分公司, 郑州 450006 |
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| 基金项目： | 本文受国家自然科学基金重点项目（41630312）和"十三·五"国家重大专项（2017ZX05005002-008）联合资助. |
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| 摘 要： | 基于三维地震、测井、岩矿测试等资料,分析了镇泾地区中生界断裂体系特征与成因,结合源岩热演化与储层物性反演结果,恢复了长8段油气成藏的动态演化过程,探讨了中生代以来构造活动对长8段油气成藏的影响作用。研究认为鄂尔多斯盆地内部镇泾构造转折区构造变形受盆地边缘影响明显,发育复杂断裂体系,构造特征及演化对油气藏的形成与分布有重要控制作用。结果表明：（1）中生界北西向、北东东向、近东西向3组断裂发育,平面上呈雁列式带状展布,剖面上为高陡产状且小断距错动。印支期北西向主断裂走滑明显,中、晚燕山期北东向断裂活动加强,喜山期北东东向次级断裂密度增大,并派生大量剪切裂隙。（2）长8段油藏经历了晚三叠世储集层、烃源岩层初始沉积形成,早白垩世初期少量低熟油近源充注形成岩性油藏,早白垩世末成熟油快速输导形成受断层及裂缝控制的构造-岩性油气藏,晚白垩世以来早期油藏调整等4个阶段。（3）印支运动控制了烃源岩及储层展布范围,I类北西向走滑断裂控制了镇泾地区中生界构造格局;中、晚燕山运动加速烃源岩热演化进程,并改善储层物性,II类断裂活动,为烃类输导提供垂向通道;喜山运动使先存中生界断裂活动,控制油气调整范围及油藏差异富集;其中北东东向II类张性或张扭性断裂导流性能好,是最为有效的富油断层。
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| 关 键 词： | 鄂尔多盆地 镇泾地区 构造转换区 断裂特征 构造演化 成藏动态过程 断裂影响作用 |
| 收稿时间： | 2020/5/12 0:00:00 |
| 修稿时间： | 2020/8/14 0:00:00 |
Meso-Cenozoic structural characteristics and their reservoir controls of structural transition area in China Craton: A case study of Yanchang Formation in Zhenjing area of southwestern Ordos Basin |
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| ZHANG YuanYuan,REN ZhanLi,HE FaQi,CUI JunPing,YANG GuiLin,WANG Kun,JI YuanYuan.Meso-Cenozoic structural characteristics and their reservoir controls of structural transition area in China Craton: A case study of Yanchang Formation in Zhenjing area of southwestern Ordos Basin[J].Acta Petrologica Sinica,2020,36(11):3537-3549. |
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| Authors: | ZHANG YuanYuan REN ZhanLi HE FaQi CUI JunPing YANG GuiLin WANG Kun JI YuanYuan |
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| Institution: | State Key Laboratory of Continental Dynamics, Xi''an 710069, China;Department of Geology, Northwest University, Xi''an 710069, China;Sinopec North China Petroleum Bureau, Zhengzhou 450006, China |
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| Abstract: | Characteristics and formation mechanisms of Mesozoic faults in Zhenjing area were analyzed according to 3D seismic data, logging curves and mineral testing, etc. Combining thermal evolution of source rock and reservoir physical property inversion, the dynamic evolution process of hydrocarbon accumulation in Chang 8 Member was restored, and the control effects of tectonic activities since Mesozoic on the formation of Chang 8 hydrocarbon accumulation was discussed. It is considered that the structural deformation of Zhenjing structural transition area in Ordos Basin is significantly affected by the basin margin, through which the complex fault system is developed. The structural characteristics and their evolution play important roles in controlling the formation and distribution of oil and gas reservoirs. The following conclusions are drawn finally:(1) Three groups of Mesozoic faults are developed in NW, NEE and nearly EW directions, with belt slip of en echelon type on the plane, short distance dislocation and high-steep output on the profile. Therein, NW-trending main faults were strike slip during Indosinian; The activity of NE-trending faults strengthened in the Mid-Late Yanshanian; and the density of NE-trending secondary faults increased and a large number of shear fractures were derived in Himalayan Period. (2) The Chang 8 reservoir experienced four stages:its primitive sediments were formed in Late Triassic; its lithologic reservoirs were formed by near-source charging of low-mature oil during Early Cretaceous; the rapid transportation of mature oil happened in Late Cretaceous to form structural-lithologic reservoirs controlled by faults and fractures; and the existing reservoirs have been adjusted since Late Cretaceous. (3) The Indosinian Movement controlled the distribution of source rocks and reservoirs, and the Type I NW-trending strike-slip faults controlled the Mesozoic tectonic framework in Zhenjing area; The Mid-Late Yanshanian accelerated the thermal evolution of source rocks, affected the process of reservoir densification, and the Type II faults provided vertical transport; The Himalayan Movement activated the pre-existing Mesozoic faults, controlled the adjustment range and the differential enrichment of oil reservoirs. Among them, the type II tension-torsion faults in the NEE-trending have good conductivity, which are the most effective oil-rich faults. |
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| Keywords: | Ordo Basin Zhenjing area Structural transformation area Fault characteristics Structural evolution Dynamic process of hydrocarbon accumulation Influence of fracture system |
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