鄂尔多斯盆地宜川-黄龙地区上古生界储层特征及其对天然气成藏的影响

单俊峰; 吴炳伟; 金科; 董德胜; 刘媛媛; 崔晓磊; 迟润龙; 聂文彬

doi:10.3969/j.issn.1006-6535.2022.06.004

特种油气藏 >

2022 , Vol. 29 >Issue 6: 29 - 38

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.06.004

地质勘探

鄂尔多斯盆地宜川-黄龙地区上古生界储层特征及其对天然气成藏的影响

单俊峰 ,
吴炳伟 ,
金科 ,
董德胜 ,
刘媛媛 ,
崔晓磊 ,
迟润龙 ,
聂文彬

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中国石油辽河油田分公司,辽宁盘锦 124010

单俊峰(1968—),男,教授级高级工程师,企业首席专家,1990年毕业于大庆石油学院地球物理专业,2007年毕业于中国地质大学(北京)矿产普查与勘探专业,获博士学位,现从事宜庆地区勘探部署研究及管理工作。

收稿日期: 2022-09-02

修回日期: 2022-09-15

网络出版日期: 2023-01-10

基金资助

中国石油重大科技专项“辽河探区可持续规模增储勘探关键技术研究”(2017E-1601);中国石油辽河油田分公司科技项目“宜川-上畛子地区古生界天然气增储上产关键技术研究”(2021KJZX-10-03)

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Characteristics of Upper Paleozoic Reservoirs and Its Influence on Natural Gas Accumulation in Yichuan-Huanglong Area, Ordos Basin

Shan Junfeng ,
Wu Bingwei ,
Jin Ke ,
Dong Desheng ,
Liu Yuanyuan ,
Cui Xiaolei ,
Chi Runlong ,
Nie Wenbin

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PetroChina Liaohe Oilfield Company, Panjin, Liaoning 124010, China

Received date: 2022-09-02

Revised date: 2022-09-15

Online published: 2023-01-10

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摘要

宜川-黄龙地区上古生界本溪组、山西组和石盒子组是勘探开发主要目的层,天然气富集成藏主要受沉积相带和储层物性控制。由于晚古生代经历了海相—海陆过渡相—陆相沉积体系演化,沉积相类型不同,储层物性变化规律尚不明晰。为此,通过沉积演化史分析,利用野外露头、钻井岩心、微观储层分析、测井曲线等资料,对宜川-黄龙地区上古生界储层特征进行综合研究。结果表明:本溪组主要发育潮坪相,山西组和石盒子组盒₈段主要发育曲流河—辫状河三角洲相,本溪组潮汐水道、山西组和盒₈段水下分流河道为最有利储集相带。本溪组潮汐水道砂体呈透镜状,分布局限,山西组曲流河三角洲前缘水下分流河道砂体多期迁移叠加,有一定规模,盒₈段辫状河三角洲前缘水下分流河道砂体纵向叠置、横向连片,呈“毯式”分布。本溪组储层以石英砂岩为主,孔隙类型以原生粒间孔、次生溶孔为主;山西组和盒₈段储层以岩屑石英砂岩为主,孔隙类型以岩屑溶孔为主。上古生界砂岩储层的岩性和孔隙结构是影响含气性的主要因素,储层整体具有特低孔、超低渗特征,但自下而上岩石组分中石英含量逐渐降低,岩屑和填隙物含量逐渐升高,自本溪组至山西组、盒₈段储层的岩性和孔隙结构逐渐变差。本溪组厚层状的潮汐水道和山西组、盒₈段连续叠置型分流河道砂体岩性纯、粒度粗、物性好、含气丰度高,为优势储集体,本溪组优质孔隙相对更发育,易于天然气富集高产。研究结果对宜川-黄龙地区勘探开发的深入及增储上产具有一定的指导意义。

关键词： 上古生界; 沉积演化; 储层特征; 成藏控制因素; 宜川-黄龙地区; 鄂尔多斯盆地

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单俊峰 , 吴炳伟 , 金科 , 董德胜 , 刘媛媛 , 崔晓磊 , 迟润龙 , 聂文彬 . 鄂尔多斯盆地宜川-黄龙地区上古生界储层特征及其对天然气成藏的影响[J]. 特种油气藏, 2022 , 29(6) : 29 -38 . DOI: 10.3969/j.issn.1006-6535.2022.06.004

Abstract

Upper Paleozoic Benxi Formation, Shanxi Formation and Shihezi Formation in Yichuan-Huanglong Area are the chief target formations for exploration and development, and the natural gas enrichment and accumulation are principally controlled by the sedimentary facies and reservoir physical properties. After the evolution of marine-marine-continental transition facies-continental sedimentary system in the Late Paleozoic, the sedimentary facies types are different and the change law of reservoir physical properties is not clear yet. Therefore, the characteristics of Upper Paleozoic reservoirs in Yichuan-Huanglong Area were comprehensively studied with sedimentary evolution analysis, field outcrops, drilling cores, micro reservoir analysis, logging curves and other data. The result shows: Benxi Formation is mainly developed with tidal-flat facies, Shanxi Formation and He₈ Member of Shihezi Formation mostly developed with meandering river-braided delta facies. Tidal channel of Benxi Formation and underwater distributary channel of Shanxi Formation and He₈ Member are the most favorable reservoir facies zones. The sand bodies of the tidal channel of Benxi Formation are lenticular in shape and limited in distribution; the sand bodies of the underwater distributary channel at the front edge of the meandering river delta in Shanxi Formation are migrated and superimposed in multiple periods, with a certain scale; the sand bodies of the underwater distributary channel at the front edge of the braided river delta in He₈ Member are superimposed vertically and connected horizontally, with a blanket-shaped distribution. The reservoir of Benxi Formation is dominated by quartz sandstone, with main pore types of primary intergranular pores and secondary dissolution pores; the reservoirs of Shanxi Formation and He₈ Member are mainly composed of lithic quartz sandstone, with main pore type of lithic dissolution pore. The lithology and pore structure of the Upper Paleozoic sandstone reservoir are the main factors affecting the hydrocarbon showing. The reservoir as a whole is characterized by extra-low porosity and ultra-low permeability, but the content of quartz in the rock gradually decreases from bottom to top, the content of rock chip and fillings gradually increases, and the lithology and pore structure of the reservoirs gradually become worse from Benxi Formation to Shanxi Formation and He₈ Member. The sand bodies of the thick tidal channel of Benxi Formation and the continuously superimposed distributary channel of Shanxi Formation and He₈ Member are lithologically pure and coarse-grained, with good physical properties and high gas abundance, and they are the dominant reservoirs, will the high-quality pores developed in Benxi Formation, which is easy to accumulate natural gas. There is much for reference of the study results to the exploration, development and reserve enhancement of Yichuan-Huanglong Area.

Key words： Upper Paleozoic; sedimentary evolution; reservoir characteristics; controlling factors of reservoir formation; Yichuan-Huanglong Area; Ordos Basin

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