CHARACTERISTICS OF SANDSTONE RESERVOIRS OF MIDDLE-LOWER JURASSIC IN CENTRAL SICHUAN AREA

doi:10.3863/j.issn.1674-

西南石油大学学报(自然科学版) ›› 2010, Vol. 32 ›› Issue (2): 35-40.DOI: 10.3863/j.issn.1674-

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CHARACTERISTICS OF SANDSTONE RESERVOIRS OF MIDDLE-LOWER JURASSIC IN CENTRAL SICHUAN AREA

LIU Zhan-guo CHEN Ya-na NI Chao LU Wen-zhong XU Zheng-yu

Hangzhou Institute of Petroleum Geology，CNPC，Hangzhou Zhejiang,310023,China）JOURNAL OF SOUTHWEST PETROLEUM UNIVERSITY(SCIENCE & TECHNOLOGY EDITION)，VOL.32，NO.2,35-40,2010（ISSN 1674-5086，in Chinese

Received:1900-01-01 Revised:1900-01-01 Online:2010-04-20 Published:2010-04-20

Abstract

Abstract:

In this paper，a systematic discussion is given on the basic characteristics of Middle-lower Jurassic sandstone reservoirs in central Sichuan area，Sichuan Basin.Lithofacies and lithology of the sandstones，which are controlled by sedimentary source with different directions and difference episodes，have succession and difference temporally and spatially.Sandstone diagenesis is characterized by strong compaction，weak cementation and replacement，and dissolution is mainly developed in Xiashaximiao Formation.Accumunative spaces in Zhenzhuchong Formation and upper member of Lianggaoshan Formation are residual intergranular pores，while in members 1 and 2 of Xiashaximiao Formation in northestern Central Sichuan，accumulative spaces are mainly solution pores of laumontite cements and feldspar grains.Based on physical property and pore structure，the sandstone reservoirs are defined as ultra-low porosity and ultra-low permeability ones.Vertically，the members 1 and 2 of Xiashaximiao Formation are of highest quality.Horizontally，the lower of the clay content is，the coarser the grain size，the better reservoir quality.Distribution characteristics reflect that reservoir properties are controlled by provenance，despositional facies and diagenesis.

Key words: Sichuan Basin, central Sichuan area, Jurassic, sandstone, reservoir

CLC Number:

TE122.2

LIU Zhan-guo CHEN Ya-na NI Chao LU Wen-zhong XU Zheng-yu. CHARACTERISTICS OF SANDSTONE RESERVOIRS OF MIDDLE-LOWER JURASSIC IN CENTRAL SICHUAN AREA[J]. 西南石油大学学报(自然科学版), 2010, 32(2): 35-40.

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CHARACTERISTICS OF SANDSTONE RESERVOIRS OF MIDDLE-LOWER JURASSIC IN CENTRAL SICHUAN AREA

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