潜江凹陷东南部新沟嘴组温压系统与油气成藏

The Geotemperature-pressure System and Their Relationship with Hydrocarbon Accumulation of Xingouzui Formation in the Southeast of Qianjiang Depression

利用实测地温和地压数据以及测井资料等,分析了潜江凹陷东南部新沟嘴组(Ex)地温、压力及温压系统特征,并从油气生成及分布角度探讨了温压系统与油气成藏的关系。结果表明,潜江凹陷东、南部各构造带具有各异的地温场及压力场,其温压系统类型也存在差异,其中新沟断垒带、马王庙鼻状构造带、建新断裂带和老新鼻状构造带属于常压常温系统,总口向斜带、拖市断背斜构造带和潘场向斜带属于超压常温系统。地温场及地层压力的不同使其内部流体的流动形式和油气运移聚集的内在规律也不尽相同。总体而言,潜江凹陷Ex油气主要分布于流体能量相对较低的常压常温系统内。

The characteristics of geotherm,pressure and geotemperature-pressure system of Xingouzui Formation(Ex)in the southeast Qianjiang Depression were analyzed based on measured geotemperature and pressure data and well logging data.The relationship between geotemperature-pressure system and hydrocarbon accumulation was studied from the aspect of oil and gas genesis and their distribution.The results indicated that there existed distinct geothermal and pressure fields in different structural regions in the southeast of Qianjiang Depression.There were different types of temperature-pressure systems,of which the Xingou Fault Horst zone,Mawangmiao Nosing Structure Zone,Jianxin Fault Zone and Laoxin Nosing Structure Zone belonged to the normal temperature and normal pressure systems,while the Zongkou Synclinal Zone,Tuoshi Nosing Structure Zone and Panchang Synclinal Zone were normal temperature-overpressure systems.Each type of temperaturepressure system has distinct fluid flow models and hydrocarbons accumulation regulations.Overall,the distribution of hydrocarbon of Xingouzui Formation in Qianjiang Depression is mainly located in the normal temperature-normal pressure systems,which have relatively low fluid energy.