塔中低凸起奥陶系深层鹰山组三、四段碳酸盐岩油气成藏要素及有利区带  

Hydrocarbon Accumulation Factors and Favorable Exploration of Carbonate Reservoirs in the 3rd-4th Members of Ordovician Yingshan Formation of Tazhong Low Salient

作　　者：祝渭平 姚清洲[1] 李闯[1] 陈永权[2] 张正红 房启飞[1] Zhu Weiping;Yao Qingzhou;Li Chuang;Chen Yongquan;Zhang Zhenghong;Fang Qifei(PetroChina Research Institute of Petroleum Exploration and Development-Northwest,Lanzhou 730020,China;Research Institute of Exploration and Development,Tarim Oilfield Company,Korla 841000,China;Zhenghua Oil Holding Limited Company,Chengdu 610000,China)

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020 [2]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [3]振华石油控股有限公司,四川成都610000

出　　处：《地球科学》2023年第2期690-704,共15页Earth Science

基　　金：中国石油集团碳酸盐岩重大项目资助(No.2021DJ0506)。

摘　　要：碳酸盐岩是塔里木盆地塔中低凸起古生界油气勘探的主要目的层,G70井在北斜坡奥陶系深层鹰四段测试获高产工业气流,展示了奥陶系深层广阔的勘探潜力,可以作为塔中低凸起碳酸盐岩下一步的接替领域;围绕油源断裂寻找优质储层仍是奥陶系深层勘探及目标优选的首选,但油源断裂的分布及优质储层展布还需进一步明确.基于塔中三维地震资料、结合单井录井、测井、油气物理性质开展油源断裂分析、储层预测及其主控因素分析.研究结果表明:塔中I号断裂东西两端、塔中10号逆断裂西段及编号F1~F16的北东向走滑断裂是奥陶系油气成藏可靠的油源断裂;古岩溶地貌相对稳定区,大面积及长时间的水-岩接触,利于岩溶洞穴储层的发育;后期走滑断裂的活动,导致岩溶作用增强或优化储层性能,在断裂与古岩溶地貌稳定区的叠合区更利于发育优质的岩溶洞穴储层.在此基础上,结合区域盖层展布、油源断裂展布及优质储层展布特征开展成藏有利区综合评价,优选出11个I类有利区带,指明了塔中隆起奥陶系深层下步有利勘探方向.Carbonate rock is the major target horizon for Paleogene oil/gas exploration in the Tazhong area of the Tazhong Low Salient,Well G70 in the north slope of Tazhong obtained high-yield industrial gas flow in the test of the fourth member of Yingshan Formation of Lower Ordovician,and the deep layer of Ordovician in the northern slope of Tazhong Low Salient showed broad exploration potential and can be used as the next important replacement domain of carbonate rocks in Tazhong uplift.Searching for high-quality reservoirs around oil source fracture is still the first choice for deep ordovician exploration target and target selection, but the distribution of o oil source fracture and distribution of high-quality reservoirs need to be further clarified.Based on 3D seismic data of Tazhong, combined with single well logging, well logging and physical properties of oil and gas, we analyzed oil source fracture characteristics, reservoir prediction and property controlling factors. It is found that the East and West ends of Tazhong No 1 fault, the west section of thrust fault in Tazhong No.10 fault belt and the numbered F1-F16 of NE strike slip fault have long-term effect of transporting oil and gas, which are the main oil source faults of Ordovician oil and gas accumulation in Tazhong Low Salient;In the relatively stable area of paleokarst landform, large-area and long-term water rock contact is conducive to the development of karst cave reservoirs;The late fault activity not only transformed the reservoir performance, but also enhanced the karstification, in the superposition area of fault and paleokarst landform stability area, it is more conducive to the development of high-quality karst cave reservoirs.Based on the above work,a comprehensive evaluation of reservoir formation was carried out based on regional seal distribution, high-quality reservoir distribution and fault distribution, and eleven Class I favorable areas selected, to direct future exploration.

关 键 词：油源断裂 储层展布 油气成藏 深层碳酸盐岩 塔中低凸起 石油地质 

分 类 号：TE121[石油与天然气工程—油气勘探]