四川盆地川西坳陷新场须家河组二段气藏甜点模式及形成机理

doi:10.11743/ogg20210407

摘要/Abstract

摘要：

致密砂岩气藏甜点评价是储量有效动用的关键。基于四川盆地川西坳陷新场须家河组二段气藏精细解剖，阐明了气藏甜点地质特征，建立了气藏甜点模式和识别标准，明确了甜点空间分布特征，探讨了致密气藏甜点形成机理。结果表明：①有效储层划分为两种类型，分别为平缝发育的中-粗粒砂岩和块状层理的中粒砂岩，且有效裂缝为倾角大于30°的构造缝；②气藏甜点可以划分3种类型，分别为断缝型、层理缝型和孔隙型甜点，断缝型甜点高角度裂缝较发育，主要分布在SN向断裂所控制的断缝体内，层理缝及孔隙型甜点高角度缝不发育，主要分布在断缝体之外的优质储层内；③构造位置较高的有利含气区是新场须二段气藏甜点发育的基础，晚期断裂影响的断缝体决定了断缝型甜点的形成，在断缝体之间，优质储层品质是层理缝及孔隙型甜点形成的主要控制因素。明确气藏甜点模式，阐明甜点形成机理，一方面可以深化致密气藏甜点理论认识，另一方面也可以为甜点分布预测和可动储量评价提供有力支撑。

关键词: 甜点模式, 评价标准, 断缝体, 优质储层, 致密砂岩气藏, 须家河组, 四川盆地

Abstract:

Sweet spot evaluation of the tight sandstone reservoirs is of great importance to effectively developing reserves.The elaborate description of the gas pools in the 2^nd member of Xujiahe Formation (Xu 2 Member/T₃x²), serves to establish the sweet spot model and formulate the criteria for identification, and clarify the geological distribution of the sweet spots.Furthermore, the forming mechanism of the sweet spots in tight sandstone gas pools is discussed.The results show that: (1) the effective reservoirs can be grouped into two categories, namely the medium-to-coarse-grained sandstone with flat fractures (with a dip angle less than or equal to 10°), and the massive medium-to-coarse-grained sandstone; the effective fractures are structural fractures with a dip angle greater than 30°.(2) The sweet spots can be classified into three categories, namely the fault-, bedding fissure-, and pore-dominated categories.The first one is characterized by high dip angle fractures, mainly developed in the fault-fracture body dominated by SN-oriented faults; the last two are characterized by less developed high dip angle fractures, mainly distributed in high-quality formations outside of the fault-fracture body.(3) Gas-bearing zones of relatively high tectonic position serve as the basis factor for the sweet spot development in T₃x², the fault-fracture body affected by later faulting is a major factor controlling sweet spot growth, and the quality of favorable formations controls the formation of the other two categories.In all, it is of great significance to building the sweet spot models and identifying its forming mechanism for the gas pools, which could deepen our understanding on the sweet spot-related theories of tight sandstone gas pools, and is of strong support to the sweet spot distribution prediction and movable reserves evaluation.

Key words: sweet spot model, evaluation criterion, fault-karst, high-quality reservoir, tight sandstone gas pool, Xujiahe Formation, Sichuan Basin

中图分类号:

TE122.3

刘君龙,胡宗全,刘忠群,等. 四川盆地川西坳陷新场须家河组二段气藏甜点模式及形成机理[J]. 石油与天然气地质, 2021, 42(4): 852-862. doi: 10.11743/ogg20210407 Junlong Liu,Zongquan Hu,Zhongqun Liu,et al. Gas pool sweet spot models and their forming mechanism in the Xu 2 Member in Xinchang area, Western Sichuan Depression, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(4): 852-862. doi: 10.11743/ogg20210407

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甜点类型	储集空间	有利岩相类型	物性		孔隙结构		含气饱和度/%	储层类型	典型井
甜点类型	储集空间	有利岩相类型	渗透率/(10^-3 μm²)	孔隙度/%	中值半径/μm	描述	含气饱和度/%	储层类型	典型井
断缝型甜点	构造缝+层理缝+基质孔隙	千层饼/平行层理中-粗砂岩	≥100.00	≥3	≥0.06	好	≥58	裂缝-孔隙型	X2
断缝型甜点	构造缝+基质孔隙	块状/斜层理中砂岩	10.00~100.00	≥3	0.04~0.06	好	≥58	裂缝-孔隙型	L150
层理缝型甜点	层理缝+基质孔隙	千层饼/平行层理中-粗砂岩	10.00~100.00	≥3	0.04~0.06	好	≥58	裂缝-孔隙型	X5
层理缝型甜点	层理缝+基质孔隙	千层饼/平行层理中-粗砂岩	0.30~10.00	≥3	0.02~0.04	好	≥58	裂缝-孔隙型	X10-2
孔隙型甜点	基质孔隙	块状/斜层理中砂岩	0.03~0.30	≥5	＜0.02	中	≥58	孔隙型	GM2
				4~5
				3~4

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