二连盆地吉尔嘎朗图凹陷剥蚀量恢复及其对油气藏的影响  

Denudation Restoration in the Jiergalangtu Sag of the Erlian Basin and Its Significance to Hydrocarbon Accumulation

作　　者：薛志文 屈争辉[1,2] 成捷[3] 王元杰 马友生 许永忠 XUE Zhiwen;QUZhenghui;CHENGJie;WANGYuanjie;MAYousheng;XU Yongzhong(Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education,China University of Mining and Technology,Xuzhou 221008,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China;Exploration Department,CNPC Huabei Oilfield Company,Renqiu 062552,China;Exploration and Department Research Institute,PetroChina Huabei Oilfield Company,Renqiu 062552,China;PetroChina Bohai Drilling Second Logging Company,Renqiu 062552,China)

机构地区：[1]中国矿业大学煤层气资源与成藏过程教育部重点实验室,徐州221008 [2]中国矿业大学资源与地球科学学院,徐州221116 [3]中国石油华北油田公司勘探事业部,任丘062552 [4]中国石油华北油田公司勘探开发研究院,任丘062552 [5]中石油渤海钻探第二录井公司,任丘062552

出　　处：《高校地质学报》2019年第5期714-721,共8页Geological Journal of China Universities

基　　金：国家重大科技专项“低煤阶煤层气富集规律及有利区块预测”（2016ZX05044-02）;中国石油天然气股份有限公司重大科技专项（2017E-15）联合资助

摘　　要：吉尔嘎朗图凹陷是二连盆地重要的产油基地之一,早白垩世腾格尔组和赛罕塔拉组沉积末期经历了两次强烈的抬升剥蚀,沉积地层剥蚀量的恢复对油气成藏评价有重要意义。文章基于钻井泥岩声波时差和镜质组反射率数据对二连盆地吉尔嘎朗图凹陷腾格尔组和赛罕塔拉组的剥蚀量进行了计算,恢复了其原始沉积厚度及埋藏过程。研究结果表明:研究区腾格尔组和赛罕塔拉组沉积后受构造反转的控制都经历了不同程度的剥蚀,腾格尔组的剥蚀厚度约为243~1933m,赛罕塔拉组的剥蚀厚度约为95~290m。剥蚀量厚度展布明显受不同方向、不同尺度断层在构造反转期的差异活动性影响,靠近西北边界断层的罕尼构造带剥蚀量相对较大,向东南缓坡带逐渐减小。区内不同构造部位剥蚀量的差异对油气成藏有直接影响,断陷区及后期反转控制的大沉积、强烈剥蚀区,烃源岩层生烃时间长。而构造反转形成的与构造走向一致的隆升带的剥蚀卸压有利于促使油气沿NE断裂面发生垂向和侧向运移,并在断裂面两侧有利的圈闭位置成藏。The Jiergalangtu sag is one of the important oil production bases in the Erlian Basin.In the early Cretaceous,the Lower Cretaceous Tenggeer and Saihantala formations experienced two intense uplifts and denudations.The recovery of denudation amount of sedimentary strata has a great significance for the evaluation of hydrocarbon accumulation.Based on data of mudstone sonic log interval and vitrinite reflectance,the denudation thickness of the Tenggeer and Saihantala formations in the Jiergalantu sag is calculated,and the original sedimentary thickness and burial process were restored.Results show that the denudation of the Tenggeer and Saihantala formations has undergone different degrees under the control of structural inversion.The denudation thickness of the Tenggeer Formation is about 243-1933 m,and that of the Saihantala Formation is about 95-290 m.The distribution of denudation thickness is obviously affected by the differential activity of faults in different directions and scales during the tectonic inversion.The denudation of the Hanni structural belt near the northwestern boundary faults is relatively large,and gradually decreases to the southeastern gentle slope zone.The difference of denudation amount in different structural parts of the area has a direct impact on hydrocarbon accumulation.Fault depression area and later inversion controlled large sedimentation and strong denudation area have a long hydrocarbon generation time of source rock.The denudation and pressure relief of uplift zone formed by structural inversion along the structural strike are beneficial to the vertical and lateral migration of oil and gas along NE fault plane and the formation of reservoir in favorable traps on both sides of the fault plane.

关 键 词：吉尔嘎朗图凹陷 赛罕塔拉组 腾格尔组 泥岩声波时差 剥蚀量 沉积厚度 

分 类 号：P618.13[天文地球—矿床学]