玛湖凹陷风城组页岩油产量影响因素及甜点评价

doi:10.7657/XJPG20220611

摘要/Abstract

摘要：

准噶尔盆地玛湖凹陷风城组页岩油资源潜力巨大，但该组岩性复杂、矿物种类多样、单层厚度小、甜点分散、裂缝发育程度不一，甜点优选难度大，严重影响了勘探进程。通过对烃源岩品质、储集层品质、工程品质及压裂规模的研究，系统分析了总有机碳含量、氯仿沥青“A”含量、孔隙度、含油饱和度、游离油含量、脆性指数、孔隙压力、两向应力差、裂缝发育程度等对产量的影响。研究表明，该组页岩油产量的关键控制因素主要有4个：游离油含量、脆性指数、裂缝发育程度及大规模体积压裂。利用研究区12口井的测井资料，分析产量与游离油、脆性、裂缝发育程度等控制因素的关系，建立适用于该组页岩油的甜点分类标准。将该分类标准应用于水平井玛页1H井分段分簇，取得了很好的应用效果，对后续勘探部署具有借鉴意义。

关键词: 准噶尔盆地, 玛湖凹陷, 风城组, 页岩油, 储集层分类, 核磁共振测井, 产量影响因素, 甜点评价

Abstract:

The Fengcheng formation in the Mahu sag is of great potential in shale oil resources. However，its characteristics such as complex lithology，diverse mineral species，thin single layer，scattered sweet spots，and variable fracture occurrence make sweet spot selection challenging，which seriously affects the exploration process. Through the studies on the qualities of source rock，reservoir and engineering，and fracturing scale，the influences of TOC，chloroform bitumen “A” content，porosity，oil saturation，free oil content，brittleness index，pore pressure，two-directional stress difference and fracture development degree on production were systematically analyzed. The results show that the shale oil production from the Fengcheng formation are mainly controlled by four factors such as free oil content，brittleness index，fracture development degree，and large-scale volume fracturing. By using the logging data from 12 wells in the study area，the correlation between production and the controlling factors was analyzed，and a sweet spot classification standard suitable for the Fengcheng formation was established. The classification standard was successfully applied to the horizontal well Maye-1H for dividing sections and clusters，and it may provide a reference for subsequent exploration deployment.

Key words: Junggar basin, Mahu sag, Fengcheng formation, shale oil, reservoir classification, NMR logging, influencing factor of production, sweet spot evaluation

中图分类号:

TE112.24

刘财广, 季瑞雪, 王伟, 张融. 玛湖凹陷风城组页岩油产量影响因素及甜点评价[J]. 新疆石油地质, 2022, 43(6): 733-742.

LIU Caiguang, JI Ruixue, WANG Wei, ZHANG Rong. Factors Influencing Shale Oil Production and Sweet Spot Evaluation of Fengcheng Formation，Mahu Sag[J]. Xinjiang Petroleum Geology, 2022, 43(6): 733-742.

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