西藏比如盆地生储盖条件分析

Analysis of source-reservoir-cap rock assemblage in Biru Basin

刘蓓蓓

Liu Beibei

中国地质大学资源学院, 湖北武汉 430074

Faulty of Earth Resource, China University of Geosciences, Wuhan 430074

根据野外地质调查资料和采样测试分析,对比如盆地的生油岩、储集层、盖层条件及其生储盖组合特征进行了分析。认为盆地中发育的主要烃源岩有两套,岩石类型主要为板岩,有机质类型好,热演化程度高,以生气为主;储集层主要为碎屑岩,岩性以含砾砂岩、粉砂岩、中-细砂岩为主,属于低孔、低渗型;盖层较发育,岩性主要为泥晶灰岩、板岩,厚度大;最有利的生储盖组合型式为中上侏罗统拉贡塘组自生自储自盖式。

On the basis of the field geologic survey data and analysis of test samples, the paper systematically studies the conditions of the source rocks, reservoir, and cop rocks.There are two sets of source rocks in Biru basin.The rock type of the source rocks is mostly slate with high maturity of organic matter and high degree of thermal evolution.The main rock type of reservoirs is clastic rock including conglomeratic rock, siltstone, and middle-fine grained sandstone with low porosity and low permeability.Thick cap rocks developed widely here, including micrite, limestones, mud stone/shale and slate.The most favorable sourcereservoir-cap assemblage is the Jurassic gas reservoir assemblage with self generating, self storing and self sealing.

https://doi.org/10.3969/j.issn.1008-2336.2010.01.031