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Received：25 May 2019，
Published：28 June 2020
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天然裂缝是致密砾岩储层重要的储集空间和主要的渗流通道，影响致密天然气的成藏、富集及单井产能。利用地表相似露头、岩心、薄片、测井和生产资料，在研究四川盆地剑阁地区须家河组致密砾岩储层天然裂缝类型和发育特征的基础上，分析并阐明了天然裂缝对天然气产能的影响。四川盆地剑阁地区须家河组致密砾岩储层发育穿砾缝、砾内缝和砾缘缝，从地质成因上，穿砾缝为构造裂缝，砾内缝包括构造、构造-成岩和母岩裂缝，砾缘缝为构造-成岩裂缝。其中穿砾缝的面密度、孔隙度和渗透率最大，其次为砾内缝，砾缘缝相对较小，穿砾缝对致密砾岩储层贡献更大，更有利于天然气富集高产。裂缝发育程度与产气量呈正相关，裂缝密度越大，产气量越高。在近东西（EW）向至NWW-SEE向现今地应力作用下，不同方向裂缝对天然气产能的贡献存在差异，其中近EW向裂缝地下开度相对较大，连通性好，对天然气产能贡献最大；其次为近NS和NW-SE向裂缝，NE-SW向裂缝对天然气产能的贡献较小。
Natural fractures are important storage space and main seepage channels in tight conglomerate reservoirs
which function to influence the accumulation
enrichment and single-well productivity of tight gas.An integration of analogous outcrop
core
thin section
well log and production data
is applied to the study on the types and characteristics of natural fractures in the tight conglomerate reservoir of the Upper Triassic Xujiahe Formation in Jian'ge area
Sichuan Basin
and then the influence analysis of natural fractures on tight gas productivity.Trans-gravel
intra-gravel and gravel-edge fractures are developed in the tight conglomerate reservoirs.In terms of geological origin
trans-gravel fractures are tectonic fractures; intra-gravel fractures include tectonic
tectonic-diagenetic and parent-rock fractures; and gravel-edge fractures are tectonic-diagenetic fractures.Among others
trans-gravel fractures are the largest in areal density
porosity and permeability
followed by intra-gravel fractures and gravel-edge ones.Thus
the trans-gravel fractures are more contributive to the formation of the tight conglomerate reservoirs
and the most conducive to natural gas enrichment with high yield.The degree of fracture development is positively correlated with gas production:the greater the fracture density is
the greater the tight gas productivity could be.Under the present-day in-situ stress trending towards the nearly east-west (EW) to NWW-SEE direction
the contributions made by fractures of diverse directions are differential on the tight gas productivity.The nearly EW-trending fractures feature bigger apertures and good connectivity
being the most favorable area for tight gas production
followed by nearly NS- and NW-SE-trending fractures
and then the NE-SW-trending ones.
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