Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Natural Gas Geoscience》 2009-01
Add to Favorite Get Latest Update

Reservoir Characteristics and Main Controlling Factors of Upper Permian Panlongdong Organic Reefs in Northeastern Sichuan

LI Xiao-yan1,2,WANG Qi1 ,ZHANG Rui1,2, ZHANG Sheng-bin1,2,ZHUO Xi-zhun1,2,ZHANG Chang-shun3(1.Key Laboratory of Gas Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Graduate School of Chinese Academy of Sciences, Beijing 100049, China; 3. Karamay Drilling Company of Western Drilling Engineering Corporation, Karamay 834009,China)  
Panlongdong organic reefs is the most typical Permian reefs of Changxing Formation in northeastern Sichuan, and its paleo-reservoir is the typical representation of this kind of reservoirs. By analyzing the lithofacies features, reservoir space, sulfur-containing asphalts characteristics and diagenesis, this paper indicates that the reef paleo-reservoir has good reservoir space and is filled with massive higher-evolution-degree asphalt, mainly carbonaceous and asphaltene asphalts. The thermochemical sulfate reduction (TSR) occurred in this reservoir, and the asphalt with high sulfur was the result of TSR reaction and provided acidic material such as H2S for dissolution at late. The replacement process of dolomitization was an equal volume replacement. Dolomitization made the dispersed small pores of Panlongdong reefs reservoir become bigger and connect, enhanced the petrosal transmission capacity and established the material base for large-scale dissolution at later time. The two stages of the dissolution had different action effects for reef reservoirs. The dissolution of parasyngenetic stage was prone to become the selective denudation pore. The advanced dissolution mainly dissolved and reformed the dolomitic reservoirs, and the dolomites whose crystal form was developed half-baked would be corrosed at first.
【Fund】: 国家重点基础研究规划“973”项目(编号:2003CB214606、2005CB422105);; 国家科技重大专项“大型油气田及煤层气开发”项目;; 中国科学院知识创新工程重要方向项目(编号:KZCX2-YW-Q05-03-05)联合资助
【CateGory Index】: P618.13
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved