歧口凹陷埕海潜山油气成藏条件与主控因素  

Hydrocarbon Accumulation Condition and Main Controlling Factors of Chenghai Buried Hill in Qikou Depression

作　　者：吴昊晟 毛敏 黄小刚 刘娟霞 刘国全[2] 赵宇超[2] 

机构地区：[1]中法渤海地质服务有限公司,天津300452 [2]中石油大港油田勘探开发研究院,天津300280

出　　处：《地质科技情报》2014年第6期99-103,共5页Geological Science and Technology Information

摘　　要：歧口凹陷在经历了复杂的基底断裂改造后形成了大量的潜山构造,而大港探区历年的潜山勘探均以高位序潜山为主,埋深较大的中、低位序潜山由于上覆巨厚的中生界和古生界,勘探程度相对较低,但勘探成效却十分显著,部分潜山井获高产。以歧口凹陷埕海潜山为例开展了油气成藏条件分析,该区油气源充足,供烃条件优越,碳酸盐岩缝洞型储层发育,构造圈闭数量多,且形成时间与排烃期有效匹配,断层与不整合面构成良好的油气输导系统,表明歧口凹陷石炭系-二叠系覆盖区中、低位序潜山成藏条件十分有利。基于该区成藏条件和勘探实践分析,进一步总结出潜山多期构造活动背景、缝洞型储层发育程度以及烃源岩条件是埕海潜山油气成藏的主控因素,直接影响潜山油气分布和富集程度。After complex basement faults reformation,a large number of buried hills formed in Qikou Depression.However in the past few years,the exploration of buried hills in the Dagang Oilfield was dominated by high-buried hills.The middle and low-buried hills with great buried depth had low exploration degrees because of upper thick Mesozoic and Palaeozoic formations.The paper takes Chenghai buried hill for example to analyze the hydrocarbon accumulation condition.The hydrocarbon resource is abundant and the supplying condition is favorable in this area.Carbonate fractured-vuggy reservoirs are widely developed.There are a lot of structural traps in Chenghai buried hill area,the forming times of which effectively matches the hydrocarbon expulsion stages.The faults and uniformity form good oil-gas migration system.The result shows that the hydrocarbon accumulation condition of middle-and low-buried hills is very favorable in Carboniferous-Permian strata covered area.Based on the analysis of reservoir condition and exploration practice in this area,the paper summarizes that multi-phase tectonic activity background of the buried hill,the development degree of fractured-vuggy reservoir and hydrocarbon condition are main controlling factors for hydrocarbon accumulation of Chenghai buried hill.They also directly affect the distribution and enrichment degree of oil and gas in Chenghai buried hill area.

关 键 词：碳酸盐岩 成藏条件 主控因素 埕海潜山 歧口凹陷 

分 类 号：TE122.3[石油与天然气工程—油气勘探]