柴西南地区油气成藏特征及有利储层预测
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摘要
柴达木盆地柴西南地区是盆地内油气资源最为富集的地区 ,目前已进入战略展开阶段。勘探实践证实该区发育E3 1、E3 2 、N1和N2 1多套成藏组合和多种油气藏类型 ,具备形成复式油气聚集带的有利地质条件。通过应用层序地层学的一般原理 ,利用钻井、地震等资料对昆北—柴西南地区进行了沉积储层的研究与预测 ,发现该区E3 1、E3 2 、N1湖侵体系域砂体发育 ,对油气的聚集与分布有利 ,砂体类型较为丰富 ,有利储集体主要在东柴山和切克里克地区发育的三角洲前缘砂体和三角洲平原水上分流河道砂体 ,同时该区深湖—半深湖沉积区沟道浊积砂体以及滨浅湖沉积区发育的湖滩砂体可以作为有利的储集体 ,形成隐蔽油气藏。目前青海油田分公司已将柴西南地区岩性油气藏列为重点目标实施勘探。
The southwest part of Chaidamu Basin is richest in hydrocarbon resources in the basin and has entered into a strategic development stage at present. Through pros pecting, it was proved that there exist E 3 1 , E 3 2 , N 1 and N 2 1 reservoiring assemblages and various types of oil/gas reser voirs in the region where the beneficial geologic conditions of forming compound hydrocarbon accumulation belts have been satisfied. On the basis of investigating and predicting the sedimentation and reservoirs on the north of Kunlun Mountains and in the southwest part of Chaidamu Basin by applying the drilling and seismic data and in consideration of the general principle of sequence stratigraphy, it was found that the lake-flooding system domain sandbodies are devel oped in these regions, which is favourable to accumulating oil and gas; the types of sandbodies are various; the benefi cial reservoir bodies are mainly the delta-front sandbodies and delta-plain distributary channel sandbodies developed in Dongchaishan and Qiekelike regions; and, in the regions, the channel turbidity sandbodies in deep-semideep lacus trine sedimentary area and the beach sandbodies in shallow shore lacustrine sedimentary area may be all regarded as the beneficial reservoir bodies of forming subtle oil/gas reser voirs. Currently the exploration for the lithologic oil/gas res ervoirs in the southwest part of Chaidamu Basin has been lis ted as the key project by the Qinghai Oil Field Branch, PCL.
The southwest part of Chaidamu Basin is richest in hydrocarbon resources in the basin and has entered into a strategic development stage at present. Through pros pecting, it was proved that there exist E 3 1 , E 3 2 , N 1 and N 2 1 reservoiring assemblages and various types of oil/gas reser voirs in the region where the beneficial geologic conditions of forming compound hydrocarbon accumulation belts have been satisfied. On the basis of investigating and predicting the sedimentation and reservoirs on the north of Kunlun Mountains and in the southwest part of Chaidamu Basin by applying the drilling and seismic data and in consideration of the general principle of sequence stratigraphy, it was found that the lake-flooding system domain sandbodies are devel oped in these regions, which is favourable to accumulating oil and gas; the types of sandbodies are various; the benefi cial reservoir bodies are mainly the delta-front sandbodies and delta-plain distributary channel sandbodies developed in Dongchaishan and Qiekelike regions; and, in the regions, the channel turbidity sandbodies in deep-semideep lacus trine sedimentary area and the beach sandbodies in shallow shore lacustrine sedimentary area may be all regarded as the beneficial reservoir bodies of forming subtle oil/gas reser voirs. Currently the exploration for the lithologic oil/gas res ervoirs in the southwest part of Chaidamu Basin has been lis ted as the key project by the Qinghai Oil Field Branch, PCL.
引文
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3 吴因业.陆相盆地层序地层学分析的方法与实践.石油勘探与开发,1997;24(5):710
4 纪有亮,张世奇.陆相断陷湖盆序地层学.北京:石油工业出版社,1996
5 徐凤银,彭德华.柴达木盆地油气聚集规律及勘探前景.石油学报,2003;24(4):16
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