摘要
经过近40 a的勘探,冀中坳陷北部(廊固和霸县凹陷)发现了生物气、低熟气、成熟气和煤型气等4种成因类型的天然气,以及生物气-低熟气、低熟气-成熟气和煤型气-低熟气的混合成因气。通过地球化学和成藏条件分析,查明了源于沙河街组的生物气、低熟气、成熟气和源于石炭—二叠系的煤型气的分布规律和鉴别特征,认为廊固凹陷柳泉和河西务地区明化镇组沉积期断层活动导致地表水渗入被抬升的沙三段烃源岩,进而导致微生物复苏而形成后生生物气,其他地区是低熟油气聚集场所;霸县凹陷文安斜坡是低熟气,同时也是煤成气聚集区,牛头镇二台阶是成熟油气聚集场所。通过天然气成藏控制因素分析,认为冀中坳陷北部天然气勘探前景良好。
Almost 40 years of exploration in the north Jizhong depression(Langgu and Baxian sub-depression) has discovered 4 genetic types of natural gases including biogenetic gas,low-mature gas,mature gas and coal-derived gas,as well as gases of hybrid origins such as biogas and low-mature gas mix,low-mature gas and mature gas mix,and coal-derived gas and low-mature gas mix.Geochemical analysis and hydrocarbon accumulation investigation have been conducted to identify the distribution of biogas,low-mature gas and mature gas originated from the Shahejie formation and the coal-derived gas originated from the Carboniferous-Permian formation.It is concluded that the faulting activity in the Minghuazhen depositional stage in the Liuquan and Hexiwu areas of the Langgu sub-depression had led surface water seeped into the uplifted Es3 source rock,and further resulted in microbe revival to form epigenetic biogas,and the other areas of the Langgu sub-depression had accumulated low-mature oil and gas;the Wenan slope in the Baxian sub-depression had accumulated low-mature gas and coal-derived gas;and the Niutouzhen low-lift had accumulated mature oil and gas.This investigation on gas accumulations suggests good gas prospecting perspectives in the north of Jizhong depression.
出处
《特种油气藏》
CAS
CSCD
2010年第4期1-5,共5页
Special Oil & Gas Reservoirs
基金
全国油气资源战略选区调查与评价国家专项"华北上古生界油气资源战略选区项目"(2009GYXQ17)
关键词
天然气
成因类型
鉴别特征
分布规律
勘探前景
冀中坳陷北部
natural gas
genetic type
identification
distribution
prospecting perspective
north Jizhong depression
