辽河坳陷大民屯凹陷沙四段湖相页岩油综合评价及勘探实践

doi:10.3969/j.issn.1672-7703.2019.05.010

摘要/Abstract

摘要： 页岩油是非常规油气勘探领域的新热点，辽河坳陷页岩油资源量巨大，是现实的接替资源之一。辽河坳陷大民屯凹陷沙四段岩性可划分为油页岩、泥质云岩、含碳酸盐油页岩、含粉砂油页岩及粉砂岩5 种，整体上具有较好的生烃条件，为页岩油资源的形成提供了物质基础。针对研究区地质条件，提出页岩油“三品质”评价方法。评价烃源岩品质，确定油气富集段；考虑原油黏度、渗透率及地层压力等因素，计算表征储层渗流能力的流动品质曲线，通过流动品质识别页岩油高渗透段；通过计算脆性矿物含量，结合地应力各向异性评价技术，开展脆性及可压裂性评价，确定工程甜点，选定合适压裂段。老井试油及新井钻探结果表明，大民屯凹陷沙四段是有利的页岩油勘探层系，在页岩油“三品质”评价基础上，选准“甜点”，进行有效的压裂改造可以形成工业产能，展现出良好的勘探前景。

关键词: 大民屯凹陷；&ldquo, 三品质&rdquo, 评价；页岩油；裂缝；甜点预测

Abstract: Shale oil is a new hotspot in unconventional oil and gas exploration. Shale oil in the Liaohe depression is abundant and deemed to be one of the most significant successive resources. The Sha 4 Member in Damintun sag is composed of oil shale, argillaceous dolomite, carbonate-bearing oil shale, silt-bearing oil shale and siltstone. They have good hydrocarbon generating conditions and provide a material basis for shale oil resources. According to the geological conditions of the study area, a “three-quality” evaluation method for shale oil is proposed: ① Evaluate the quality of source rocks to determine oil enrichment zones; ② Considering factors such as crude oil viscosity, permeability and formation pressure, calculate the flow quality curve that characterizes reservoir permeability, and identify high-permeability zones; ③ Evaluate brittleness and fracturability, find engineering sweet spot zones, and select target fracturing zones by calculating brittle composition and analyzing geostress anisotropy. Test data of old wells and drilling data of new wells show that the Sha 4 Member in Damintun sag is favorable for shale oil exploration. Using the “three-quality” evaluation method to select sweet spot zones and conduct effective fracturing stimulation, it is helpful to constructing industrial capacity and approaching to a promising exploration future.

Key words: Damintun sag, “three-quality&rdquo, evaluation, shale oil, fractures, sweet spot prediction

中图分类号:

李晓光, 刘兴周, 李金鹏, 田志. 辽河坳陷大民屯凹陷沙四段湖相页岩油综合评价及勘探实践[J]. 中国石油勘探, 2019, 24(5): 636-648.

Li Xiaoguang, Liu Xingzhou, Li Jinpeng, Tian Zhi. Comprehensive evaluation and exploration practice of Sha 4 lacustrine shale oil in Damintun sag, Liaohe depression[J]. China Petroleum Exploration, 2019, 24(5): 636-648.

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