潜江凹陷钟市地区油气成藏特征及成藏模式

Hydrocarbon Accumulation Features and Accumulation Modes in Zhongshi of Qianjiang Depression

基于大量钻井、测井资料及油气地球化学特征和流体包裹体测试分析,从烃源岩、储集层、盖层、圈闭等成藏要素及其时空配置关系,对潜江凹陷钟市地区油气成藏条件、特征及富集规律进行了研究。研究认为:研究区潜江组具有较好的成藏条件,主要受鼻状构造、砂体展布、油源断层及荆沙红墙控制。在此基础上建立了钟市地区油气成藏模式:源内—侧向多期成藏模式、源外—侧向—垂向多期成藏模式。钟市鼻状构造是油气运移有利指向区,油气主成藏期与构造活动期相匹配,油气主要通过砂体和断层进行阶梯式运移。该研究可为钟市地区油气勘探和目标优选提供理论依据。

Based on extensive drilling,logging,geochemistry and fluid inclusion test data,the source-rock,reservoir,capo-rock,trap and other hydrocarbon accumulation elements and their time-space configurations are analyzed to study the hydrocarbon accumulation conditions,features and enrichments in Zhongshi of Qianjiang Depression. Research shows that the Qianjiang Formation with favorable hydrocarbon accumulation conditions is mainly controlled by nose-structure,sandbody distribution,oil-source fault,Jingsha Redwall and the corresponding hydrocarbon accumulation modes in Zhongshi are established,including in-source- lateral multi- stage accumulation mode and out- source- lateral- vertical multi- stage accumulation mode. The nose structures in Zhongshi are considered as favorable area for hydrocarbon accumulation,the major hydrocarbon accumulation stage is consistent with tectonic movement stage and the hydrocarbon migrates through sandbodies and faults with multi-step. This research could provide certain theoretical reference for hydrocarbon exploration and optimization in Zhongshi.