川中地区三叠系须家河组二段致密气储层特征及主控因素

doi:10.12108/yxyqc.20250112

岩性油气藏 ›› 2025, Vol. 37 ›› Issue (1): 137–148.doi: 10.12108/yxyqc.20250112

川中地区三叠系须家河组二段致密气储层特征及主控因素

杨杰¹, 张文萍², 丁朝龙¹, 石存英¹, 马云海¹

1. 东方地球物理公司研究院地质研究中心, 河北涿州 072751;
2. 中国石油浙江油田公司, 杭州 310023

收稿日期:2024-08-06 修回日期:2024-09-13 出版日期:2025-01-01 发布日期:2025-01-04
第一作者:杨杰（1994—），男，硕士，助理工程师，主要从事致密气储层评价与预测研究方面的工作。地址：（072751）河北省涿州市甲秀路39号东方地球物理公司研究院地质研究中心。Email：yangjie941207@126.com。
基金资助:
国家科技重大专项“中西部重点碎屑岩层系油气富集规律与勘探方向”（编号：2016ZX05002-005）、浙江油田科技项目“浙江油田地震解释与地质评价技术研究”（编号：zjyt-2024-kj-14）联合资助。

Characteristics and main controlling factors of tight gas reservoirs in the second member of Triassic Xujiahe Formation，central Sichuan Basin

YANG Jie¹, ZHANG Wenping², DING Chaolong¹, SHI Cunying¹, MA Yunhai¹

1. Geological Research Center, BGP, CNPC, Zhuozhou 072751, Hebei, China;
2. PetroChina Zhejiang Oilfield Company, Hangzhou 310023, China

Received:2024-08-06 Revised:2024-09-13 Online:2025-01-01 Published:2025-01-04

摘要/Abstract

摘要： 为了明确川中地区三叠系须家河组二段（须二段）致密气优质储层特征、成因及分布特征，综合利用铸体薄片、扫描电镜、核磁共振、高压压汞试验和CT测试等资料，明确了储层质量的主控因素，优选多种宏观和微观参数，通过Q型聚类对储层进行了定量划分，并对各类别储层的分布特征进行了分析。研究结果表明：①川中三叠系须二段为岩屑长石砂岩和长石岩屑砂岩，平均孔隙度和平均渗透率分别为6.58%和0.21 mD，为特低孔—低孔、低渗致密气储层；储集空间以残余粒间孔和粒内溶孔为主，其次为粒间溶孔和裂缝，孔隙和喉道半径分别为1.31～55.00 μm和0.05～1.04 μm，为微米孔隙和微米-亚微米喉道组合。②研究区沉积作用控制了岩石粒度和泥质含量，是决定初始孔隙度形成和后期演化的基础条件；强烈的机械压实和胶结作用分别破坏了14.6%～20.1%和9.8%～15.1%的原始孔隙，是造成储层致密化的主要原因；次生溶蚀、绿泥石包膜等建设性成岩作用形成了次生溶孔且对原生孔隙具有一定保护作用，挤压破裂形成的裂缝进一步扩大了次生溶蚀范围，是将致密砂岩改造成优质储层的关键。③研究区须二段储层可分为4类，不同类型储层的物性和微观结构差异较大，Ⅰ，Ⅱ类储层物性好、试气产能高，是主要的“甜点”储层和有利开发目标，主要分布于区域中部H1，H3井区和东部H125井区，纵向上集中在须二上亚段。

关键词: 致密气储层, 沉积作用, 压实作用, 胶结作用, 次生溶蚀孔, 分选性, Q型聚类, 须二段, 三叠系, 川中地区

Abstract: In order to clarify the characteristics，genesis and distribution of favorable reservoir in the second member of Xujiahe formation，comprehensively utilizing the thin sections，scanning electron microscopy， nuclear magnetic resonance，mercury injection and CT testing，the main controlling factors of tight gas reservoirs were analysed. And based on the macro and micro parameters，classify the tight gas reservoirs quantitatively and distribute foe different kinds of reservoirs according to Q-cluster analysis. The results show that：（1）The reservoirs in the second member of Xujiahe formation in Hechuan area of central of Sichuan Basin are lithic feldspar sandstone and feldspar lithic sandstone，with an average porosity and permeability of 6.58% and 0.21 mD， which is typical ultra-low porosity and low permeability reservoir. The reservoir space in the second member of Xujiahe Formation is mainly residual intergranular pore and intragranular dissolved pore，secondly is intergranular dissolved pore and fissure，the pore and throat radius range from 1.31 μm to 55 μm and 0.05 μm to 1.14 μm， classifying them as micrometer pores and millimeter-micrometer throats.（2）The granularity and shale content is controlled by the sedimentary，which is the basic for primary pore and its evaluate，while the pore distribution by compaction and cementation is 14.6%-20.1% and 9.8%-15.1%，which is the significance reason for the reservoir densification. The dissolution and chlorite formed lots of intragranular dissolved pore，and protect some intergranular pore，which is helpful to the improve the tight reservoir into favorable reservoir.（3）Multiple parameters such as reservoir quality and pore structure was selected to divide the tight gas reservoirs into 4 kinds of different reservoirs，the reservoir quality and pore structure are different from each other in different kinds of reservoirs. TheⅠ-type and Ⅱ-type reservoirs have a greater reservoir quality and pore structure，which is the main“sweet spot”in tight gas reservoirs and favorable development target in study area. TheⅠ-type and Ⅱ-type reservoirs are development in H1，H3 well in the central and H125 well in the east，and they concentrated development in the third and second layer in the upper of the second member of Xujiahe Formation.

Key words: tight gas reservoir, sedimentation, compaction, cementation, secondary dissolved pores, selectity, Q-mode clusting, the second member of Xujiahe Formation, Triassic, central of Sichuan Basin

中图分类号:

TE122.3

杨杰, 张文萍, 丁朝龙, 石存英, 马云海. 川中地区三叠系须家河组二段致密气储层特征及主控因素[J]. 岩性油气藏, 2025, 37(1): 137–148.

YANG Jie, ZHANG Wenping, DING Chaolong, SHI Cunying, MA Yunhai. Characteristics and main controlling factors of tight gas reservoirs in the second member of Triassic Xujiahe Formation，central Sichuan Basin[J]. Lithologic Reservoirs, 2025, 37(1): 137–148.

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川中地区三叠系须家河组二段致密气储层特征及主控因素

Characteristics and main controlling factors of tight gas reservoirs in the second member of Triassic Xujiahe Formation，central Sichuan Basin

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