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川东—渝北地区石炭系古岩溶储层稀土元素地球化学特征

发表时间:2009-05-15  浏览量:1290  下载量:419
全部作者: 胡忠贵,郑荣才,胡九珍
作者单位: 成都理工大学油气藏地质及开发工程国家重点实验室
摘 要: 石炭系黄龙组岩溶岩系是川东—渝北地区天然气藏最重要的储层类型之一,依据岩溶岩的结构特征,将黄龙组岩溶岩系划分为弱溶蚀岩溶岩、中等溶蚀多孔状岩溶岩、强溶蚀角砾状岩溶岩和强溶蚀交代次生灰质岩溶岩等4种类型。岩溶岩中发育有淡水方解石和淡水白云石2种胶结物类型,以及再埋藏期沉淀的热液异形白云石。稀土元素分析结果表明:不同岩石结构、成分和不同溶蚀强度的岩溶岩及其胶结物的地球化学特征有显著差异,证明稀土元素的迁移、配分、富集和异常效应不仅可以判别岩溶过程中的流体性质和古水文条件,同时也可作为评价和预测古岩溶储层的重要标志之一。
关 键 词: 地球化学;川东—渝北地区;石炭系黄龙组;古岩溶;稀土元素
Title: Geochemical characteristics of rare earth elements of paleokarst-reservoirs in Huanglong formation in the eastern Sichuan-northern Chongqing area
Author: HU Zhonggui, ZHENG Rongcai, HU Jiuzhen
Organization: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology
Abstract: The carbonatite paleokarst rock series of Huanglong formation of upper carboniferous is one of the most important natural gas reservoirs in Linshui of eastern Sichuan-northern Chongqing area. Based on the structural features of karst rocks, the Huanglong formation’s karst rock series is divided into 4 types including slight corrosion karst rock, medium corrosion and porous karst rocks, strong corrosion-brecciated karst rocks and strong corrosion and alternation of secondary grey-karst rocks. Moreover, two types of cements of limnic-calcite and limnic-dolomite, and hydrothermal dolomite of reburial period are included in the karst rocks. By the synthetic analysis of geochemical characteristics of rare earth elements, the conclusion was indicated that karst rocks and their cements with different rock textures, components and corrosion strengths had obviously various REE geochemistry characteristics. According to the studies mentioned above, it is defined that the removing,distributing patterns, enriching regularity and abnormal effect of the REE is not only used to distinguish fluid property and paleo-hydrologic condition, but also evaluate and forecast paleokarst rock reservoirs.
Key words: geochemistry; eastern Sichuan-northern Chongqing area; Huanglong formation of carboniferous; paleokarst; rare earth elements
发表期数: 2009年5月第9期
引用格式: 胡忠贵,郑荣才,胡九珍. 川东—渝北地区石炭系古岩溶储层稀土元素地球化学特征[J]. 中国科技论文在线精品论文,2009,2(9):927-935.
 
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