河北霸县凹陷兴隆宫地区沙三段岩性油气藏成藏条件与圈闭模式  

Stratigraphic Hydrocarbon Reservoir's Accumulation Elements and Trap Models in 3^(rd) Member of Shahejie Formation in Xinglonggong Area,Baxian Depression,Hebei

作　　者：李胜利[1] 梁宏斌 于兴河[1] 曹兰柱 李瑞军 李顺利[1] 郑学超 

机构地区：[1]中国地质大学能源学院,北京100083 [2]中国石油华北油田分公司,河北任丘450006

出　　处：《现代地质》2009年第3期523-530,共8页Geoscience

基　　金：中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室开放基金项目(EEL2008-6);高等学校博士学科点专项基金项目(20050491001)

摘　　要：裂谷型凹陷深层的油气勘探前景一直为众多学者所关注。兴隆宫地区紧临霸县生油洼槽,其沙三段埋深较大,勘探程度较低,少量探井证实这一些地区的沙三段具良好的油气成藏前景。应用石油地质学中的油气成藏理论,系统论述该区有利的岩性油气藏成藏条件与圈闭模式:沙三段圈闭接近沙四段、沙三段及沙一段的油源,具有优越的油气源条件;沙三段大型三角洲前缘与浊积扇等储层条件较好;沙三段同沉积构造与坡折带利于岩性油气藏形成;膏泥岩、盐岩及泥岩提供盖层与保存条件。而该区沙三段岩性油气藏成藏的圈闭模式可分为3个区带:陡坡带主要发育构造—岩性圈闭、小型三角洲前缘砂岩岩性圈闭;缓坡带以大型三角洲前缘砂岩岩性圈闭、地层超覆、地层不整合圈闭为主;而洼槽带以坡折附近的尖灭砂体圈闭为主。陡坡坡折之下发育扇三角洲前缘与浊积扇圈闭;缓坡坡折之下发育与低位三角洲、浊积扇及滩坝砂体有关的岩性圈闭。通过研究可以确定东部文安缓坡坡折带以下地区是目前岩性油气藏的最有利勘探区带。The petroleum exploration prospective of deep strata in rift depression is always concerned by lots of geologists. Xinglonggong area, closely adjacent to Baxian depression which is the petroleum generation depression, has many advantageous hydrocarbon accumulation conditions. In this area, some industrial petroleum traps were searched in Dongying Formation and 1^st Member of Shahejie Formation. The petroleum exploration degree of this area was much lower than those of other places in 34 Member of Shahejie Formation, which was the deep strata in the Baxian depression, although a few exploration wells confirmed that there were some favorable elements to hydrocarbon＇s accumulation, especially, to the stratigraphic reservoirs. According to hydrocarbon accumulation theory of petroleum geology, the favorable conditions of stratigraphic hydrocarbon accumulation and trap models discussed in this paper are as follows： Firstly, the hydrocarbon sources are sufficient because the traps of the 3^rd Member of Shahejie Formation are close to source rocks which are shales from the 4^th, 3^rd and 1^st members of Shahejie Formation; Secondly, the reservoir conditions are very good owing to the sandbodies of large scale delta front and some turbidity deposition; Thirdly, oil accumulation of stratigraphic reservoir benefits from the slope breaks and synsedimentary structures; Finally, the gypsum, gypsum shales, shaly gypsum, halites and shales can act as caprocks. According to the structure area dividing, three area-models of strafigraphic petroleum trap are summarized： abrupt slope, gentle slope and depression models. In abrupt slope area, structure-stratigraphy-trap and small scale delta front sandbodies developed. In gentle slope area, hydrocarbon is prone to accumulate in large scale delta front, overlapping strata and some sandbodies adjacent to unconformity. However, in the depression area, pinched out sandbodies are typical, i. e. , below the break areas of abrupt slope, fan delta front reservoirs and turbidity sandbodi

关 键 词：霸县凹陷 兴隆宫地区 沙三段 岩性油气藏 圈闭模式 

分 类 号：TE122.1[石油与天然气工程—油气勘探]