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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。
The Lower Marlite-conglomerate section of the third member of Shahejie Formation in Shulu Sag is a special tight oil and gas reservoir. With the gradual advancement of tight oil and gas exploration in Shulu Sag, the study on the division of petrological-conglomerate rock types and their petrological characteristics has directly determined the identification of lithology at different scales and the optimization of reservoir lithology. Based on the core coring data, rock mineral identification and X-ray diffraction data, the rock types, petrological characteristics and lithologic distribution of dominant reservoirs are studied from the macroscopic to microscopic systems. The marl- This paper systematically analyzes the petrological characteristics of 4 types and 10 kinds of rocks, such as marl, conglomerate, sandstone and mudstone, and systematically analyzes the lithological characteristics of conglomerate and laminar marlstone The two dominant reservoir lithologies provide the basis for prediction of the dominant reservoir and reservoir “sweet spot ” area in this area.