四川盆地安岳气田震旦系走滑断裂控储作用  

Control of strike-slip faults on Sinian carbonate reservoirs in Anyue gas field,Sichuan Basin,SW China

作　　者：何骁 唐青松[2] 邬光辉[1,3] 李飞 田威振[3] 罗文军 马兵山[3] 苏琛 HE Xiao;TANG Qingsong;WU Guanghui;LI Fei;TIAN Weizhen;LUO Wenjun;MA Bingshan;SU Chen(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;PetroChina Southwest Oil&Gas Field Company,Chengdu 610051,China;School of Geosciences and Technology,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]中国石油西南油气田公司,成都610051 [3]西南石油大学地球科学与技术学院,成都610500

出　　处：《石油勘探与开发》2023年第6期1116-1127,共12页Petroleum Exploration and Development

基　　金：中国石油-西南石油大学创新联合体科技合作项目(2020CX010101);国家自然科学基金重大研究计划重点项目(91955204)。

摘　　要：通过四川盆地安岳气田深层震旦系走滑断裂、储集层资料综合分析,研究走滑断裂带白云岩储集层主控因素,探讨走滑断裂对优质“甜点”(缝洞)储集层发育与分布的控制方式。结果表明,震旦系灯影组碳酸盐岩基质储集层致密,孔隙度小于4%、渗透率小于0.5×10^(-3)μm^(2),但走滑断裂及其溶蚀作用发育,能够使碳酸盐岩渗透率提高1个数量级以上,而且断裂相关溶蚀孔隙度可提高1倍以上,形成沿走滑断裂带广泛分布的走滑断控缝洞型“甜点”储集层。走滑断控储集层主要形成于震旦纪末,具有“相-断-溶”三元复合控储机理,台缘带岩溶控储作用显著,台内断-溶共控优质储集层发育,具有分区、分类与分带差异性。走滑断裂带的结构控制裂缝带与断控“甜点”储集层的差异分布,并形成宽阔的缝洞带。走滑断裂相关“甜点”储集层是深层古老碳酸盐岩高效开发的有利新类型,需要根据走滑断裂控储的多样性与差异性实施针对性的开发部署措施。The strike-slip faults and reservoirs in deep Sinian strata in the Anyue gas field of the Sichuan Basin were analyzed to identify the main controlling factors of dolomite reservoirs along the strike-slip fault zone and clarify how the strike-slip faults control the development and distribution of high-quality“sweet spot”(fractured-vuggy)reservoirs.The carbonate matrix reservoirs of the Sinian Dengying Formation are tight,with low porosity(less than 4%)and low permeability(less than 0.5×10^(-3)μm^(2)).However,the strike-slip faults and their dissolution processes increased the permeability of carbonate rock by more than 1 order of magnitude and allowed the faulting-related dissolution porosity to be more than doubled.The“sweet spot”fractured-vuggy reservoirs controlled by strike-slip faults occurred widely along the strike-slip fault zone.These reservoirs were formed at the end of the Sinian under the joint control of sedimentary microfacies,faulting and karstification.At the platform margin,the control of karstification is predominant;while high-quality reservoirs controlled by both faulting and karstification are developed with the platform,and they are different in areas,types and zones.The structures of the strike-slip fault zone controlled the differential distribution of the fracture zones and the fault-controlled“sweet spot”reservoirs,and led to wide fracture-vug zones.In conclusion,the strike-slip fault related“sweet spot”reservoirs represent a new type of targets for efficient development of resources in deep ancient carbonates.For these reservoirs,specific development strategies should be made according to the diverse and differential controls of strike-slip faults on the reservoirs.

关 键 词：前寒武系 震旦系 灯影组 走滑断层 碳酸盐岩储集层 断裂作用 控制因素 储集层分布 四川盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]