桂中—南盘江地区黔水地1井打屋坝组页岩储层含气性及可压性评价

doi:10.19388/j.zgdzdc.2023.06.03

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摘要桂中—南盘江地区的黔水地1井在直井钻探过程中获得了稳定的页岩气流,取得了石炭系打屋坝组良好的海相页岩气发现。基于钻井、录井、测井、测试资料分析,通过对打屋坝组页岩储层岩相、有机地球化学、物性、裂缝发育程度和含气性等开展综合研究,解释了研究区页岩储层的含气性及可压性。研究发现: ①打屋坝组为一套从碳酸盐斜坡相的下斜坡亚相过渡至台盆相的巨厚泥页岩层系,其中打屋坝组一段上部—三段中下部发育好—优质烃源岩,天然裂缝发育,气测全烃最大值63.41%,解吸气量平均值1.08 m³/t,具备良好的页岩气生成条件和资源潜力; ②主要含气层段的脆性矿物含量为31%~94%,泊松比平均值为0.31,体积弹性模量平均值为27.2 GPa,破裂压力为29.7~48.5 MPa。综合评价显示该套地层具备较好的破裂潜力和裂缝保持能力,大规模体积压裂容易形成复杂裂缝网络,该套地层压力较高,具备压裂形成工业产能的条件,可作为下一步勘探开发的目标层段。

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关键词 ：黔水地1井, 打屋坝组, 页岩气, 含气性, 可压性

Abstract：The stable shale gas flow was obtained during vertical well drilling of Qianshuidi 1 Well in Guizhong-Nanpanjiang area, meaning the good marine shale gas was discovered in Carboniferous Dawuba Formation. Based on the drilling, logging, well logging, analysis and testing data, the authors in this paper comprehensively studied the lithofacies, organic geochemistry, physical properties, fracture development and gas bearing of Dawuba Formation shale reservoir, and explained the gas bearing and compressibility of shale reservoir in the study area. The results show that: ① Dawuba Formation consists of a set of huge thick shale system which is from the lower slope subfacies of carbonate slope facies to the huge thick shale series of platform basin facies, and Good to high-quality source rock are well developed in the middle lower part of the third member and the upper part of the first member, with developed natural fractures. The maximum value of total hydrocarbon in gas logging is 63.41%, and the average value of desorption gas is 1.08 m³/t, with good shale gas generation conditions and resource potential. ② The total content of brittle minerals in the main gas bearing intervals is 31%~94%, and the average Poisson's ratio is 0.31. The average bulk modulus of elasticity is 27.2 GPa, and the fracture pressure is between 29.7 MPa and 48.5 MPa. This set of strata has good fracture potential and fracture retention ability, which means the complex fracture networks would be easily formed under large-scale volumetric fracture. Besides, the set of strata has high pressure and meets the conditions for fracturing to form industrial production capacity, making it a target layer for further exploration and development.

Key words： Qianshuidi 1 Well Dawuba Formation shale gas gas bearing compressibility

收稿日期: 2023-03-21

中图分类号:	P618.13
	TE132.2

基金资助:中国地质调查局“桂中—南盘江页岩气地质调查(编号: DD20190088)”项目资助

通讯作者: ^*苑坤(1985—),男,高级工程师,主要从事页岩气地质调查及储层评价等工作。Email: cheerlist@qq.com。

作者简介: 郭军(1983—),男,高级工程师,主要从事页岩气地质调查与钻探等工作。Email: 603178746@qq.com。

引用本文:

郭军, 苑坤, 郭经纬, 陈相霖, 李岩. 桂中—南盘江地区黔水地1井打屋坝组页岩储层含气性及可压性评价[J]. 中国地质调查, 2023, 10(6): 25-30.
GUO Jun, YUAN Kun, GUO Jingwei, CHEN Xianglin, LI Yan. Gas bearing and compressibility evaluation of shale reservoir in Dawuba Formation of Qianshuidi 1 Well in Guizhong-Nanpanjiang area. , 2023, 10(6): 25-30.

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http://journal25.magtechjournal.com/Jwk_dzdc/CN/10.19388/j.zgdzdc.2023.06.03 或 http://journal25.magtechjournal.com/Jwk_dzdc/CN/Y2023/V10/I6/25

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