川南自贡区块页岩储层最佳靶体优选

doi:10.13809/j.cnki.cn32-1825/te.2022.03.012

Abstract

Abstract:

Zigong Block, which is located in the southern side of Weiyuan Slope in Sichuan Basin, is a monocline in NW-SE direction. O₃w-S₁l^1-1 is the target layer of that block, which develops black shale with rich organic matters in deep-water continental shelf, while the longitudinal heterogeneity of the reservoir is strong. Different penetration degrees in the sweet spot of horizontal shale well lead to different testing results. In order to determine the longitudinal distribution of the optimal shale target and guide the tracking and adjustment of horizontal well drilling trajectory, based on stratigraphic subdivision, fine evaluation of reservoir is carried out by the comprehensive data of drilling, logging, well testing and laboratory analysis. Meanwhile, the gas production profile data are used to evaluate the impact of the target on shale gas productivity of the horizontal wells. The research results show that: ①Under the influence of both sedimentation and tectonics, the lower part of S₁l^1-1-1 are the optimal “sweet spots” for both geology and engineering among target layers; ②The production well logging data indicate that, the lower part of S₁l^1-1-1shows highest gas production contribution of per unit length, which is the optimal target position of the research area; ③The effective fracking length of shale reservoir in the lower part of S₁l^1-1-1 for horizontal well is the key factor for gas well productivity in Zigong Block. Based on the above results, which supports the productivity evaluation of shale gas effectively, and sets the foundation for realizing large-scale and cost-efficient development of shale gas in that block, the longitudinal distribution thickness of the optimal target in Zigong Block is accurate from 2~5 m to 1~2 m.

Key words: fine evaluation of reservoirs, analysis of gas-production profile, target position optimization, high-quality shale reservoir, Wufeng-Longmaxi Formation

CLC Number:

TE121

Chenglin ZHANG,Xuefeng YANG,Shengxian ZHAO, et al. Target position optimization for shale reservoirs in Zigong Block of southern Sichuan Basin[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(3): 496-505.

Figures/Tables 11

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层位		脆性矿物含量		TOC		孔隙度		总含气量		含气饱和度
层位		区间（%）	均值（%）	区间（%）	均值（%）	区间（%）	均值（%）	区间（m³/t）	均值（m³/t）	区间（%）	均值（%）
龙一₁亚段	龙一₁⁴小层	63.4~69.6 （59）	66.5	2.2~2.7 （59）	2.5	4.5~5.1 （59）	4.9	2.6~4.7（21）	3.6	65.3~69.2 （59）	67.2
	龙一₁³小层	61~69 （11）	64.2	2.5~3.7 （11）	3.1	5.0~6.8 （11）	5.8	3.7~4.3（4）	3.9	60.6~67.4 （11）	65.0
	龙一₁²小层	67~78.1 （9）	73.5	2.2~2.9 （9）	2.6	3.7~6.0 （9）	4.9	3.1~4.3（4）	3.7	62.8~74.4 （9）	68.8
	龙一₁¹小层	77~84.3 （11）	81.2	5.2~7.9 （11）	6.0	6.6~7.3 （11）	6.9	3.5~7.8（5）	6.0	78.8~84.7 （11）	82.4
五峰组		79.5~87.3 （16）	82.2	2.7~3.9 （16）	3.2	3.6~4.3 （16）	4.0	3.5~6.3（6）	5.3	74.6~80.6 （16）	78.4

层位		泊—杨脆性指数（v/v）	泊松比	杨氏模量（10⁴ MPa）	最小水平主应力（MPa）	岩石破裂压力（MPa）
龙一₁亚段	龙一₁⁴小层	41~58	0.19~0.26	2.8~4.5	82~89	92~107
	龙一₁³小层	45~56	0.21~0.26	2.7~3.2	84~90	97~108
	龙一₁²小层	41~56	0.20~0.25	2.9~3.7	85~88	99~107
	龙一₁¹小层	48~62	0.18~0.24	3.1~4.4	79 ~88	85 ~104
五峰组		44~61	0.19~0.28	3.2~4.6	80~93	87~117

储层分类		地质参数					工程参数			适用性
储层分类		脆性矿物含量（%）	TOC （%）	孔隙度（%）	含气饱和度（%）	总含气量（m³/t）	泊—杨脆性指数（v/v）	最小水平主应力（MPa）	岩石破裂压力（MPa）	适用性
Ⅰ类	Ⅰ_a类	≥75	≥4	≥6	≥70	≥5	≥60	≤85	≤95	靶体精细设计
Ⅰ类	Ⅰ_b类	70~75	3~4	5~6	65~70	3~5	55~60	85~88	95~100	靶体精细设计
Ⅱ类		60~70	2~3	3~5	60~65	2~3	45~55	88~91	100~105	页岩气开发方案地质储量计算下限
Ⅲ类		50~60	1~2	2~3	55~60	1~2	30~45	≥91	≥105	页岩气探明储量计算下限

Target position optimization for shale reservoirs in Zigong Block of southern Sichuan Basin

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