Coupling Relation between Provenance and Diagenesis of Siliciclastic Reservoirs in the Yanchang Formation, Ordos Basin
详细信息
- 责任者：Ding Xiaoqi (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Han Meimei
- 刊名：Geology and Prospecting
- 出版年：2013
- 卷期：49(2)
- 关键词：物源分析 ; provenance analysis ; 成岩作用 ; diagenesis ; 砂体 ; sand bodies ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.384-392
- 图表：illus., 32 refs.
- 分类号：1003
- issnNo：ISSN0495-5331
- isbnNo：CN11-2043/P
摘要
Tight lithologic reservoirs occupy an increasing percentage with development of petroleum exploration,and will be an important exploration target in the future.Diagenesis resulted from varied grain compositions exerts a strong control on the quality of tight siliciclastic reservoirs.This paper studies the relationship among framework grains,pore types and diagenesis in the upper Triassic Chang 8 to 6 members in the Ordos basin,and analyzes the diagenesis differences resulting from various kinds of provenance.The results show that the diagenesis is controlled significantly by the source rocks of Chang 8 to 6 members in the basin.(1) Rigid framework grains,like quartz and feldspars,have crucial influences on mechanical compaction.(2) The formation of laumontite and chlorite coats cement is controlled by volcanic rock fragments largely,and the dissolution of volcanic rock fragments and laumontite cement can form secondary pores.(3) The hydrolyzation of biotite can offer abundant iron and magnesium favorable for the formation of chlorite coats,while biotite can result in extensive mechanical compaction because of ductile deformation.(4) Dissolution of carbonate fragments can offer additional material for forming carbonate cement.Therefore,studies of provenance can help to forecast diagenesis for deeply-seated tight siliciclastic reservoirs.
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