摘要
束鹿凹陷沙河街组三段下亚段泥灰岩-砾岩段是一套特殊的致密油气储层。随着束鹿凹陷致密油气勘探逐步推进,泥灰岩-砾岩段岩石类型的划分及其岩石学特征的研究直接决定了不同尺度下岩性的识别和优势储层岩性的优选。以系统取心井岩心观察、岩矿鉴定和X-射线衍射全岩分析资料为基础,从宏观到微观系统研究了岩石类型、岩石学特征、优势储层岩性分布,提出了泥灰岩-砾岩多维岩性分类方案,系统分析了泥灰岩、砾岩、砂岩和泥岩等4大类、10种岩石类型的岩石学特征,并优选了纹层状泥灰岩和颗粒支撑陆源砾岩2种优势储层岩性,为该区优势储层段和储层"甜点"区预测提供依据。
Calcilutite and rudstone in the lower part of Member 3 of Shahejie Formation, Shulu sag, is a unique tight hydrocarbon reservoir. With gradual exploration of tight oil and gas in Shulu sag, lithology identification under different scales and optimization of dominant reservoir lithology are directly determined by division of rock types and researches of petrological characteristics of calcilutite and rudstone. Based on systematical core observation, rock-mineral determination and whole-rock X-ray diffraction analysis data, rock types, petrological charac- teristics and distribution of dominant reservoir lithology were systematically studied from macro to micro scope, and a multidimen- sional lithological classification scheme for calcilutite and rudstone was proposed. Moreover, petrological characteristics of 10 rock types in four major types, i. e. , rudstone, sandstone, calcilutite and mudstone, were also systematically analyzed. Meanwhile, two types of dominant reservoir lithology, i. e. , laminated calcilutite and grain-supported terrigenous rudstone, were optimally taken as the regional dominant lithoghy, providing suggestions for optirnization of dominant hydrocarbon reservoir and ＂sweet spot＂.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2015年第B11期21-30,共10页
Acta Petrolei Sinica
基金
中国石油天然气股份有限公司重大科技专项(2014E-035)资助
关键词
岩石类型
岩石学特征
优势岩性
沙河街组三段下亚段
束鹿凹陷
rock types
petrological characteristics
dominant lithology
lower part of Member 3 of Shahejie Formation
Shulu sag
