酒泉盆地营尔凹陷下白垩统烃源岩分布特征  

Distribution and characteristic of lower Cretaceous source rocks in Ying'er sag, Jiuquan basin

作　　者：周一博[1] 柳广弟[1] 谭修中 高岗[1] 周在华 王银会[1] 钟佳倚[1] 刘庆顺[1] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油玉门油田分公司勘探开发研究院,甘肃酒泉735019

出　　处：《油气地质与采收率》2013年第1期20-23,27,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家重点基础研究发展"973"计划"中低丰度天然气藏成藏机理"(2007CB209503)

摘　　要：在对酒泉盆地营尔凹陷层序地层划分的基础上,利用地震资料和重点井的测井和录井信息建立不同体系域下不同沉积相与暗色泥地比之间的关系,预测了营尔凹陷下白垩统暗色泥岩的分布。通过测井资料计算泥岩有机碳含量,进一步确定了暗色泥岩中烃源岩的厚度,预测了目的层烃源岩的分布。结果表明,下沟组和赤金堡组湖侵和高位体系域下部发育中强振幅、中低频率、中高连续的地震相,是烃源岩的有利发育区;下沟组烃源岩分布范围广,有机质丰度高,为研究区的主力烃源岩;而深部赤金堡组烃源岩厚度大,具有较大的生烃潜力,是下一步勘探的主要方向。Based on the sequence stratigraphy study, the relationship between dark mudstones content and sedimentary facies within different system tracts is observed and used to forecast the distribution of dark mudstones in the main formation combined with the seismic data and well log. However, not all dark mudstones can generate hydrocarbon, so, the source rock criterion is discussed by analyzing pyrolysis data of mudstones, and then the source rock quality is calculated by using logging data for the early-stage prediction of source rocks thickness. The results show that the favorable source rock in lacustrine progressive system tracts and the bottom of highstand system tracts of Xiagou Formation and Chijinpu Formation are related to a group of reflectors with medium-strong amplitude, medium-low frequency and medium to comparatively good lateral continuity. The source rock of Xiagou Formation with high organic content and wide-range distribution is the main hydrocarbon source in Ying'er Sag, while Chijinpu Formation with thick dark mudstones is the potential source rock and the target of the further exploration.

关 键 词：层序地层 地震相 烃源岩达标率 下白垩统 营尔凹陷 

分 类 号：TE112.113[石油与天然气工程—油气勘探]