准噶尔盆地腹部车排子-莫索湾古隆起成因机制及油气意义  

The genetic mechanism and petroleum significance of Chepaizi-Mosuowan paleo-uplift in the central Junggar Basin

作　　者：林会喜[1] 宁飞 苏皓 张奎华[2] LIN HuiXi;NING Fei;SU Hao;ZHANG KuiHua(Research Institute of Petroleum Exploration and Production,SINOPEC,Beijing 100083,China;Shengli Oilfield Company,SINOPEC,Dongying 257015,China)

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]中国石油化工股份有限公司胜利油田分公司,东营257015

出　　处：《岩石学报》2022年第9期2681-2696,共16页Acta Petrologica Sinica

基　　金：中石化科技部项目(P20062);国家自然科学基金项目(41972128、41872161);中国科学院A类战略性先导科技专项(XDA14010402)联合资助.

摘　　要：车排子-莫索湾古隆起是准噶尔盆地腹部的正向构造单元,油气成藏条件优越,其形成演化过程对于挤压环境下“凹中隆”格局的变形史有较大的指示意义。本文通过区域构造分析和地震资料精细解释明确了车排子-莫索湾古隆起的构造特征及演化过程,通过砂箱实验模拟揭示了古隆起的成因机制。研究结果表明,古隆起以古潜山形式存在于盆地腹部,在白垩系沉积前为轴向NE-SW的宽缓背斜,脊线高点位于征1井附近,南北两端弯曲,整体成“S”形。古隆起的演化可分为四个阶段:中侏罗世前的基底调整稳定期;中侏罗世在西北缘边界挤压下盆地腹部缓慢隆升雏形期;晚侏罗世古隆起快速隆升形成期;白垩纪-新生代受盆地南缘控制整体南倾改造期。受中、晚侏罗世达尔布特断裂左行走滑作用影响,扎伊尔山系派生SE向挤压应力导致的远程传递作用使盆地腹部发育平缓的背斜,隆起轴线与西北缘断阶带走向近平行;乌伦古地块南界的右行剪切作用使得古隆起轴线向北东弯曲,盆地边界形态及南缘挤压剪切造成古隆起上升并转向。古隆起在油气成藏过程中具有较好的聚油作用,尽管后期形态改造造成了原有油气藏部分被破坏,但也导致油气向北西运移并聚集。本文研究认为,该地区今后的油气勘探方向应以岩性及构造-岩性复合油气藏为主。Chepaizi-Mosuowan paleo-uplift,an area with favorable hydrocarbon accumulation conditions,is a positive structure in the middle of Junggar Basin.The formation and evolution of this paleo-uplift is of great significance to the deformation history of“uplift in the depression”framework under compressional backgrounds.By application of the analysis of regional structural events and detailed interpretation of seismic data,the structural characteristics and evolution process of Chepaizi-Mosuowan paleo-uplift were clarified,and the genetic mechanism of the paleo-uplift was revealed by the method of structural physical model based on sandbox experiment.Results show that the paleo-uplift existed in the middle of the basin in the form of a buried hill,and for more detail,it was a wide and gentle anticline with a NE-SW axis before Cretaceous deposition.The peak of the ridge line was located near Well Zheng 1 and curved at both north and south ends,forming an“S”shaped outline as a whole.The deformation and evolution of the paleo-uplift can be divided into four stages:the basement adjustment and stabilization period before Middle Jurassic;the embryonic stage of slowly uplifted in the Middle Jurassic under the northwestward compression;the forming stage of the paleo-uplift rapidly uplifting in the Late Jurassic;the whole south dipping period controlled by the south margin of the basin from Cretaceous to Cenozoic.Influenced by the left-lateral strike-slip movement of the Darbute fault in the Middle and Late Jurassic,the uplift of the Zaire Mountains derived a SE compression stress whose remote transmission resulted in the gentle development of the anticline in the middle of the basin,and the axis of the uplift was nearly parallel to the fault step belt in the northwestern margin.Meanwhile,the lateral shear of the southern boundary of the Wulungu block made the axis of the uplift bend to the northeast,and the paleo-uplift went upward and sheared off as influenced by the shape of basin boundary and the compressional shear

关 键 词：准噶尔盆地 车排子-莫索湾古隆起 构造解析 运动学演化 成因机制 砂箱实验 物理模拟 

分 类 号：P542[天文地球—构造地质学] P618.13[天文地球—地质学]