川中地区中二叠统栖霞组优质白云岩储层特征及发育模式

徐会林; 罗文军; 杨东凡; 兰雪梅; 杨亚男; 闫梦楠; 付蕾; 唐思哲

doi:10.12055/gaskk.issn.1673-3177.2024.01.002

天然气勘探与开发 >

2024 , Vol. 47 >Issue 1: 12 - 23

DOI: https://doi.org/10.12055/gaskk.issn.1673-3177.2024.01.002

资源勘探

川中地区中二叠统栖霞组优质白云岩储层特征及发育模式

徐会林 ,
罗文军 ,
杨东凡 ,
兰雪梅 ,
杨亚男 ,
闫梦楠 ,
付蕾 ,
唐思哲

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中国石油西南油气田公司勘探开发研究院四川成都 610041

徐会林,男,1991年生,工程师,硕士;主要从事开发地质方面的研究工作。地址：（610041）四川省成都市高新区天府大道北段12号。E-mail：xuhuilin@petrochina.com.cn

修回日期: 2024-01-05

网络出版日期: 2024-03-01

基金资助

四川省自然科学基金项目（编号：2023NSFSC0261）

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Characteristics and development models of high-quality dolomite reservoirs in Middle Permian Qixia Formation, central Sichuan Basin

XU Huilin ,
LUO Wenjun ,
YANG Dongfan ,
LAN Xuemei ,
YANG Yanan ,
YAN Mengnan ,
FU Lei ,
TANG Sizhe

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Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China

Revised date: 2024-01-05

Online published: 2024-03-01

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摘要

四川盆地中部地区（简称“川中地区”）中二叠统栖霞组白云岩储层薄、非均质性强,白云岩储层发育模式尚不完全明确,亟须准确掌握白云岩储层特征及发育模式,以期实现川中地区栖霞组强非均质性薄储层效益开发。基于川中地区栖霞组实钻井的岩心观察、薄片鉴定、阴极发光和地球化学分析等方法,对白云岩储层特征及发育模式进行研究。研究结果表明：①川中地区霞组为滩相白云岩储层,储层岩性以细—中晶残余砂屑云岩为主;②白云岩储层单层厚度薄,平均单井厚度仅5.8 m,低孔隙度、低渗透率,可划分为裂缝-孔洞型、孔洞型和孔隙型3种类型,其中裂缝-孔洞型、孔洞型为优质白云岩储层;③颗粒滩是白云岩储层发育的物质基础,滩体受到准同生期岩溶作用和准同生期白云石化作用形成白云岩储层,在埋藏期断裂系统进一步叠加改造白云岩储层从而形成更加优质的缝洞发育的白云岩储层,即“滩体控有无、白云石化控规模、断裂控品质”的“三控”优质白云岩储层发育机理。结论认为：川中地区栖霞组白云岩储层存在“高能滩相+准同生期岩溶作用和准同生期白云石化作用”“高能滩相+准同生期岩溶作用和准同生期白云石化作用+断裂叠加改造作用”两种优质白云岩储层发育模式。

关键词： 准同生白云石化; 准同生期岩溶作用; 优质白云岩储层; 发育模式; 栖霞组; 川中地区

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徐会林 , 罗文军 , 杨东凡 , 兰雪梅 , 杨亚男 , 闫梦楠 , 付蕾 , 唐思哲 . 川中地区中二叠统栖霞组优质白云岩储层特征及发育模式[J]. 天然气勘探与开发, 2024 , 47(1) : 12 -23 . DOI: 10.12055/gaskk.issn.1673-3177.2024.01.002

Abstract

Dolomite reservoirs in the Middle Permian Qixia Formation of central Sichuan Basin are thin and strongly heterogeneous, with their development models unknown. It is needed to accurately understand the reservoir characteristics and development models for purpose of beneficial exploitation. By means of core observation, thin section identification, cathodoluminescence and geochemical analysis for wells of the Formation, the reservoir characteristics and development models were studied. The results are as follows: (i) The Qixia Formation dolomite reservoirs, belonging to beach facies, are dominated by fine- to medium-crystal residual psammitic dolomites. (ii) The dolomite reservoirs are thin layers, with an average thickness of only 5.8 m per well, featured by low porosity and low permeability. They can be divided into three types: the fractured-vuggy, the vuggy, and the porous, in which the fractured-vuggy and vuggy reservoirs are of high quality. (iii) Grainy beach is the material basis for the development of dolomite reservoirs. The reservoirs are formed by beach bodies subjected to penecontemporaneous karstification and penecontemporaneous dolomization. In the burial stage, the fault system further transformed the reservoirs to form high-quality dolomite reservoirs with developed fractures and vugs. In other words, the development of dolomite reservoirs shows a “three-control” mechanism, i.e., control of beach body on reservoir formation, control of dolomization on reservoir scale, and control of fault on reservoir quality. It is concluded that the high-quality dolomite reservoirs of Qixia Formation have two development models: high-energy beach facies + penecontemporaneous karstification and penecontemporaneous dolomization; and high-energy beach facies + penecontemporaneous karstification and penecontemporaneous dolomization + fault transformation.

Key words： Penecontemporaneous dolomitization; Penecontemporaneous karstification; High-quality dolomite reservoir; Development model; Qixia Formation; Central Sichuan Basin

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