彭水地区常压页岩气储层特征及有利区评价

doi:10.13809/j.cnki.cn32-1825/te.2020.05.002

摘要/Abstract

摘要：

基于地质、测录井和实验分析资料,运用建立的页岩气储层定量表征方法,开展了彭水地区上奥陶统五峰组—下志留统龙一段常压页岩气储层研究,认为①—⑤小层内的优质页岩储集空间以有机质孔隙、页理缝或层理缝为主。FIB（聚焦离子束）测得的算术平均孔径以中孔为主（20~50 nm）,而体积加权平均孔径为大孔（100 nm）,这表明大孔是总体积和孔隙度的主要贡献者。岩心尺度裂缝导致气测突然降低或增高和小层级别的页岩气发生迁移。Maps新方法表明：隆页1井①小层的层理缝是张开且连续的,张开宽度为4.69 μm;顺层剪切缝的张开宽度为1.1~2.67 μm,层理缝与顺层剪切缝的面孔率之和为1.39 %,约占样品总孔隙度的1/3,说明层理缝与天然构造缝是主要的页岩气储层空间。与超压页岩气藏相比,常压区页岩储层的孔隙度略低,高角度缝及层理缝更发育。根据常压页岩气的储层评价参数与标准,对武隆向斜①—⑤小层页岩段进行评价,Ⅰ类储层有利区为620.22 km²。

关键词: 下志留统, 常压页岩气, 岩石相, 储层评价, 彭水地区

Abstract:

Based on geological, logging and experimental analysis data, normal-pressure shale gas reservoir of Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Member in Pengshui area has been researched by the established quantitative characterization method, and it is found that the reserving space of high-quality shale in ①—⑤ layers is mainly composed of organic pores and bedding joints. The arithmetic average aperture measured by FIB nanotechnology with higher resolution ranges is from 20 to 50 nm, being mainly mesopores. However, the volume weighted average aperture is 100 nm, being macropore. In terms of the measured pore volume, macropore is the main contributor to total volume and porosity. Core-scale fractures lead to the abrupt decrease or increase of gas logging and the migration of shale gas at layer-level. The new method, Maps, show that the bedding joints in layer① of well-Longye-1 are open and continuous with an opening width of 4.69 μm, and the opening width of bedding shear joint is 1.1~2.67 μm. The sum of plane porosity for bedding and bedding shear joints is 1.39 %, which accounts for about 1/3 of the total porosity of the sample. It confirms the important contribution of bedding fracture and natural tectonic fracture for shale gas reservoir spaces. Comparing with the overpressure shale gas reservoirs, the porosity of shale reservoir in normal-pressure area is slightly low, and the high-angle seam and bedding joints are more developed. A new parameters and criteria method for evaluating normal-pressure shale gas reservoirs has been established. By this method, favorable reservoir area of type I reservoir is of 620.22 km² in layer ① to ⑤ of Wulong syncline.

Key words: Lower Silurian, normal-pressure shale gas, petrological facies, reservoirs evaluation, Pengshui

中图分类号:

TE37

彭勇民,龙胜祥,何希鹏,唐建信,聂海宽,高玉巧,薛冈,凡渝东,刘雨林. 彭水地区常压页岩气储层特征及有利区评价[J]. 油气藏评价与开发, 2020, 10(5): 12-19.

PENG Yongmin,LONG Shenxiang,HE Xipeng,TANG Jianxin,NIE Haikuan,GAO Yuqiao,XUE Gang,FAN Yudong,LIU Yulin. Characteristics of normal-pressure shale gas reservoirs and evaluation of its favorable areas in Pengshui[J]. Reservoir Evaluation and Development, 2020, 10(5): 12-19.

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顶深/m	底深/m	岩性	沉积构造
2 150.0	2 150.8	笔石炭质页岩	笔石种属单一,个体开始变大,黄铁矿条带0.8 cm,高角度缝5条,裂缝长50 cm,黄铁矿结核,3.5 cm×0.9 cm
2 150.8	2 152.3	笔石炭质页岩	裂缝发育,方解石充填
2 152.3	2 153.4	笔石炭质页岩	方解石纹层,笔石发育,细小直笔石,少量类似壳类生物碎片,笔石种属单一,无黄铁矿纹层及结核
2 153.4	2 155.1	炭质页岩	多条方解石充填缝、最长1.3 m,顶部15、16块方解石脉,21块高角度缝、网状缝,笔石密集2.1 cm×0.15 cm
2 155.1	2 156.2	炭质页岩	煤化断口光滑,贝壳状断口,方解石充填高角度缝
2 156.2	2 157.0	硅质页岩	高角度方解石缝,27块褶皱变形构造,网状裂缝,3 mm
2 157.0	2 158.0	炭质页岩	染手,大量笔石,种属较多,向上炭质含量增高,零星片状碎片,33块1.6 cm×0.2 cm,密集发育
2 158.0	2 158.5	硅质页岩	黄铁矿斑,少量笔石,少量不连续方解石纹层,高角度缝0.6 cm×0.3 cm
2 159.5	2 160.2	瘤状灰岩	第5块高角度方解石缝,后被溶蚀,缝长1 m,缝宽6 mm

评价类别	优质页岩厚度/m	TOC/%	孔隙度/%	脉冲衰减法渗透率/10^-3 μm²	常规渗透率/10^-3 μm²	孔径大小/nm	含气量/（m³?t^-1）
好（Ⅰ类）	≥30	≥3.0	≥4	≥500	≥0.100	≥10	≥2.5
中（Ⅱ类）	[15,30）	[2,3）	[2,4）	[100,500）	[0.010,0.100）	[2,10）	[1.5,2.5）
差（Ⅲ类）	<15	<2.0	<2	<100	<0.010	<2	<1.5