| 摘要: |
| 通过岩心观察、矿物及元素分析等手段，分析了济阳坳陷义和庄凸起前第三系埋藏风化壳结构的矿物学与元 素地球化学特征。结果表明:义和庄凸起前第三系埋藏风化壳具有风化黏土层和半风化岩石的二层结构；由半风化 岩石到风化黏土层,抗风化能力弱的长石等原生矿物逐渐减少，次生黏土矿物逐渐富集,半风化岩石上部与风化黏 土层为Fe，Al元素的富集带,Ca,Na元素大量流失，K,Mg元素由于交代作用变化较复杂;义和庄凸起埋藏风化壳结 构在油气成藏过程中起主要作用的是半风化岩层中部的孔缝连通体,它既为油气运移的良好通道,也可成为有效储 层;风化黏土层与t覆岩层一起形成了复合型盖层。 |
| 关键词: 埋藏风化壳 黏土矿物 不整合 封盖层 运移通道 |
| DOI： |
| 分类号: |
| 基金项目:中国石油化I股份公司重大科技攻关项目(P06012> |
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| Mineralogical and geochemical characteristics of buried weathering crust structure and its control over reservoir |
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LI Xiao-yan1,JIANG You-lu1,CHEN Tao1,ZHAO Le-qiang2
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(1. College of Geo-Resources and Information in China University of Petroleum, Dongying 257061, Chirm;2. Shengli Oilfield Branch Company，SINOPEC, Dongying 257001，China)
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| Abstract: |
| The mineralogical and geochemical characteristics of pre-tertiary buried weathering crust structure in Yihezhuang uplift of Jiyang depression were studied on the basis of core observation, mineralogical and geochemical examination. The results show that the buried weathering crust structure includes weathered clay layer and sapropelic rock. From the sapropelic rock to the weathered clay layer, the primary minerals that are not resistible to weathering such as feldspar decreased gradually and the secondary clay mineral increased gradually. In the clay layer and the upper part of the sapropelic rock, Fe and A! element are rich and Ca and Na element lost heavily. But K and Mg element are usually variable owing to the replacement. The pore-fissure-systenns in the middle of the sapropelic rock of buried weathering crust structure is significant to the migration and accumulation of petroleum and provides migration pathway and accumulating place for oil. The overlying clay rock can become the reservoir s capping layer together with the weathered clay. |
| Key words: buried weathering crust clay mineral unconformity capping layer migration pathway |
