海相高成熟页岩气储层孔隙连通关系——以彭水地区龙马溪组为例

摘要/Abstract

摘要：

孔隙连通关系影响着页岩气的渗流及产出程度,但对页岩连通关系的研究还相对薄弱。以彭水地区五峰—龙马溪组页岩气层为例,通过多种实验手段刻画页岩的连通孔隙组合类型,分析孔喉连通关系。研究发现,页岩储层发育有机孔相互连通、有机孔—微裂缝连通、有机孔—黏土孔连通和黏土孔—晶间孔连通4类组合关系。以有机孔相互连通组合为主的富有机质页岩,符合短导管状孔喉组合模式,孔喉比最小;而以有机孔—黏土孔相互连通组合为主的中、贫有机质页岩,为短导管和树形孔隙复合模式,孔喉比较大。当TOC（有机碳含量）/黏土矿物含量比值减小时,树形孔隙比例增多,孔喉比也会变小。小孔喉比和高含量的有机孔相互连通孔隙组合,有利于减弱压裂液滞留产生的水锁伤害。

关键词: 页岩储层, 孔隙组合, 孔喉连通性, 孔喉结构, 彭水地区

Abstract:

Micro-pore connectivity affects the seepage and production of shale gas, but there are less research on shale connectivity currently. Taking the Wufeng-Longmaxi formation shale gas reservoir in Pengshui area as an example, the connected pore assemblages of shale gas reservoirs were classified, and then the pore-throat connections of different types of shales were discussed based on a variety of experimental methods. Four types of connected pore assemblages were classified in shale, that is, organic pore interconnection, organic pore-micro-fracture interconnection, organic pore-clay pore interconnection, and clay pore-intergranular pore interconnection. Organic-rich shale, mainly composed of interconnected organic pore assemblages, conforms to the short-conduit pore-throat assemblage model with the minimum pore-throat ratio. While medium-low organic shale, mainly composed of interconnected organic pore-clay pore assemblages, is a composite model of short-conduit and tree-shaped pore with the relatively large pore-throat ratio. When the ratio of TOC/clay mineral content decreases, the tree-shaped pore-throat ratio increases and the pore-throat ratio decreases. The combination of small pore throat ratio and high content organic pore interconnection is conducive to reducing water lock damage caused by fracturing fluid retention.

Key words: shale reservoirs, pore assemblages, pore-throat connectivity, pore-throat structure, Pengshui area

中图分类号:

TE37

肖佃师,卢双舫,房大志,孔星星,陈方文,李吉君. 海相高成熟页岩气储层孔隙连通关系——以彭水地区龙马溪组为例[J]. 油气藏评价与开发, 2019, 9(5): 45-53.

XIAO Dianshi,LU Shuangfang,FANG Dazhi,KONG Xingxing,CHEN Fangwen,LI Jijun. Pore connectivity of marine high-maturity shale gas reservoirs: A case study in Longmaxi formation, Pengshui area[J]. Reservoir Evaluation and Development, 2019, 9(5): 45-53.

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编号	深度/ m	是否参与建模	TOC/ %	石英/ %	黏土/ %	孔体积/（cm³·g^-1）	计算孔体积/ （cm³·g^-1）	不同类型孔隙占比/%
编号	深度/ m	是否参与建模	TOC/ %	石英/ %	黏土/ %	孔体积/（cm³·g^-1）	计算孔体积/ （cm³·g^-1）	有机孔	黏土矿物有关孔	脆性矿物晶间孔
PY1-2	2 156.98	是	3.52	63.0	29.0	0.011 1	0.010 6	70.6	10.4	19.0
PY1-6	2 151.20	是	3.63	55.6	23.3	0.010 5	0.010 8	71.6	8.2	20.2
PY1-13	2 134.77	是	1.88	41.0	32.0	0.004 6	0.007 0	44.4	29.4	26.2
PY1-22	2 106.35	是	0.90	34.0	34.0	0.005 9	0.005 5	27.2	40.1	32.7
LY1-6	2 828.68	是	4.87	55.8	23.0	0.014 8	0.013 5	77.2	6.6	16.3
LY1-12	2 820.24	是	4.50	53.0	22.0	0.012 1	0.012 7	75.8	6.6	17.6
LY1-18	2 805.50	是	1.70	41.0	30.0	0.006 2	0.006 7	42.3	29.1	28.5
LY1-19	2 794.40	是	1.38	33.8	41.0	0.006 5	0.006 5	35.0	40.5	24.5
LY1-9	2 824.42	否	5.04	58.6	21.8	0.015 4	0.013 8	60.4	10.2	29.4
LY1-17	2 807.46	否	2.40	37.0	38.0	0.008 9	0.008 3	47.7	29.4	22.9
PY1-1	2 157.78	否	2.22	40.3	42.7	0.008 3	0.008 0	45.9	34.5	19.6
PY1-23	2 097.51	否	0.61	33.0	26.0	0.004 6	0.004 4	23.0	38.1	38.9