南盘江盆地郎岱地区下石炭统鹿寨组页岩气保存条件研究
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1.油气藏地质及开发工程国家重点实验室(成都理工大学);2.中海石油(中国)有限公司湛江分公司;3.中国石化勘探分公司

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TE122;P618.130.1

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中国石化勘探分公司科技先导项目


Research on the preservation conditions of shale gas in the Lower Carboniferous Luzhai Formation in Langdai area, Nanpanjiang Basin
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State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation of Chengdu University of Technology

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    摘要:

    页岩气的保存是中国南方海相页岩气勘探突破的关键因素,南盘江盆地勘探潜力巨大,其中郎岱地区鹿寨组作为页岩气赋存的主要地层,以深水台盆相的泥页岩、硅质岩和含泥硅质岩为主,有机质类型为Ⅱ1型和Ⅱ2型,TOC为2.0%~3.0%,Ro为2.0%~2.5%。本文通过野外剖面实测、野外裂缝统计、扫描电镜、有机地球化学测试、突破压力测试、流体包裹体鉴定等手段,采用权重系数对各评价参数进行叠加,通过均值聚类分析法对郎岱地区鹿寨组页岩气保存条件进行分析,从页岩埋深、页岩厚度、封盖条件、构造形态、断裂发育特征、裂缝发育特征6类影响因素建立保存条件评价指标,划分了3类页岩气保存条件有利区,有效体现出不同参数对保存条件的影响程度,评价结果更加准确可靠。其中Ⅰ类有利区位于新寨向斜核部,其埋深和封盖条件等物质基础优越,形态好且断裂影响较弱;Ⅱ类有利区位于新寨向斜及晴隆向斜北部区域,受地层倾角和埋深影响,其页岩系统物质基础一般;郎岱向斜以及晴隆向斜的Ⅱ类保存区外为Ⅲ类有利区,构造破坏较强,对页岩气保存不利。

    Abstract:

    The preservation of shale gas is identified as a key factor in the breakthrough of marine shale gas exploration in southern China. The Nanpanjiang Basin holds tremendous exploration potential, with the Luzhai Formation in the Langdai area serving as the primary stratum for shale gas occurrence. This formation predominantly consists of deep-water platform facies mud shale, siliceous rock, and silty siliceous rock. The organic matter is classified as Type II1 and II2, with a total organic carbon (TOC) content ranging from 2.0% to 3.0%, and a thermal maturity (Ro) between 2.0% and 2.5%. In this study, an analysis of the shale gas preservation conditions in the Luzhai Formation of the Langdai area was conducted by employing a variety of methods, including field section measurement, field fracture statistics, scanning electron microscopy, organic geochemical testing, breakthrough pressure testing, and fluid inclusion identification. The evaluation parameters were superimposed using a weighting coefficient, and the mean clustering analysis method was applied. An evaluation index for preservation conditions was established based on six categories of influencing factors: shale burial depth, shale thickness, sealing conditions, structural morphology, fracture development characteristics, and fissure development characteristics. Three categories of favorable areas for shale gas preservation were delineated, effectively reflecting the degree of influence of different parameters on preservation conditions, thus making the evaluation results more accurate and reliable. The Class I favorable area is located at the core of the Xinzhai anticline, where the material foundation for burial depth and sealing conditions is superior, with favorable morphology and relatively weak fracture influence. The Class II favorable area is situated at the Xinzhai anticline and the northern region of the Qinglong anticline, where the shale system's material foundation is average due to the influence of stratum dip angle and burial depth. Surrounding the Langdai anticline and the Class II preservation area of the Qinglong anticline lies the Class III favorable area, where structural damage is more pronounced, adversely affecting the preservation of shale gas.

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盛烈豪,李坤,薛煜恒,等. 南盘江盆地郎岱地区下石炭统鹿寨组页岩气保存条件研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-21
  • 最后修改日期:2024-06-14
  • 录用日期:2024-06-24
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