源—储分类新方法在川东地区页岩气井产量分析中的应用

doi:10.13809/j.cnki.cn32-1825/te.2022.03.004

摘要/Abstract

摘要：

利用总有机碳含量（TOC）、孔隙度等实验分析和水平井钻井试气等相关资料,开展了南川区块海相页岩储层源—储耦合关系与典型高低产井原因分析。研究表明,页岩有机质与储集空间紧密相连,互相依存,二者之间形成复杂的源—储耦合关系,TOC（源）和孔隙度（储）是表征源—储配置类型的关键参数,可划分为富碳高孔、中碳中孔、低碳低孔等12种类型,对页岩源—储相配置系进行半定量评价;同时,通过引入源—储分类新方法,建立了研究区五峰组—龙马溪组Ⅰ、Ⅱ、Ⅲ类页岩储层源—储配置评价标准,结合研究区开采工艺相似的8口水平井源—储配置评价与试气产量分析表明,Ⅰ类源—储配置层段在水平井段中占比越大,压裂试气产量越高。源—储分类新方法是页岩气井地质评价与压后产能分析的实用工具,具有推广意义。

关键词: 总有机碳含量, 孔隙度, 源—储耦合系数, 五峰组—龙马溪组, 川东地区

Abstract:

By using the experimental test data such as the total organic carbon content（TOC） and porosity and the drilling and testing data of horizontal wells, the researches on the source-reservoir coupling relationship of marine shale reservoirs in Nanchuan district and the reasons for typical high and low field wells have been carried out. The researches show that the shale organic matter and storage space are closely connected and interdependent, forming a complex source-reservoir coupling relationship between each other. The TOC（the source） and the porosity（the reservoir） are the key parameters to characterize the source-reservoir configuration types. There are 12 categories, including high-carbon with high-porosity, medium-carbon with medium-porosity, and low-carbon with low-porosity, for the semi-quantitative evaluation. By introducing this new method of source-reservoir classification, the evaluation criteria of source-reservoir configuration for Ⅰ, Ⅱ and Ⅲ shale reservoirs of Wufeng-Longmaxi Formation in the study area are established. Combining the source-reservoir configuration evaluation and gas test production analysis of 8 horizontal wells with similar mining technology in the study area, it is shown that the larger the proportion of class Ⅰ source reservoir configuration in horizontal wells, the higher the fracturing gas test production. The new source-reservoir classification method is a practical tool for geological evaluation and post-compression productivity analysis of shale gas wells, and has the popularization significance.

Key words: total organic carbon（TOC）, porosity, source-reservoir coupling coefficient, Wufeng-Longmaxi Formation, Eastern Sichuan

中图分类号:

TE122

刘雨林,范凌霄,房大志等. 源—储分类新方法在川东地区页岩气井产量分析中的应用[J]. 油气藏评价与开发, 2022, 12(3): 429-436.

Yulin LIU,Lingxiao FAN,Dazhi FANG, et al. Application of a new source-reservoir classification method in production analysis of shale gas wells in Eastern Sichuan[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(3): 429-436.

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储配置类别		源—储配置类型
储配置类别		TOC（源）≥4 %	TOC（源）：2 %~4 %	TOC（源）：1 %~2 %	TOC（源）<1 %
孔隙度（储）（%）	≥4	富碳高孔源—储	高碳高孔源—储	中碳高孔源—储	低碳高孔源—储
	2~4	富碳中孔源—储	高碳中孔源—储	中碳中孔源—储	低碳中孔源—储
	<2	富碳低孔源—储	高碳低孔源—储	中碳低孔源—储	低碳低孔源—储

井名	1-3号小层钻遇率（%）	返排率（%）	Ⅰ类占比（%）	Ⅱ类占比（%）	12 mm油嘴试气产量（10⁴ m³/d）	水平段长（m）	压裂段数（段）	加液量（m³）	加砂量（m³）
JY-AHF井	100	2.36	96.96	1.38	32	1 538	20	36 904.05	1 348.60
JY-BHF井	100	2.34	79.10	4.87	16	1 400	20	41 156.40	1 430.40
JY-CHF井	95	3.90	94.43	3.38	24	1 459	20	42 099.89	1 215.39
JY-DHF井	100	3.88	89.66	0	26	1 512	19	40 486.00	1 223.10
JY-EHF井	94	7.38	89.17	9.02	22	1 529	18	34 155.45	1 106.29
JY-FHF井	94	2.98	93.51	2.43	31	1 440	18	34 375.40	1 072.70
JY-GHF井	100	5.09	84.70	8.93	18	1 423	19	36 480.70	1 485.10
JY-HHF井	100	3.57	81.88	18.13	15	1 422	20	41 222.60	1 355.10