| 微观非均质性对砂砾岩储层致密化的影响机理: 以准噶尔盆地东道海子凹陷DN8井区上二叠统梧桐沟组为例 |
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| 引用本文： | 曹江骏,罗静兰,马迪娜·马吾提汗,盛伟琰,毛倩茹,杨涛,邸文渊,宋昆鹏.微观非均质性对砂砾岩储层致密化的影响机理: 以准噶尔盆地东道海子凹陷DN8井区上二叠统梧桐沟组为例[J].地球科学,2021,46(10):3435-3452. |
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| 作者姓名： | 曹江骏 罗静兰 马迪娜·马吾提汗 盛伟琰 毛倩茹 杨涛 邸文渊 宋昆鹏 |
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| 作者单位： | 1.西北大学地质学系大陆动力学国家重点实验室, 陕西西安 710069 |
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| 基金项目： | 国家科技重大专项2017ZX05008-004-004-001国家自然科学基金面上项目41972129 |
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| 摘 要： | 为研究砂砾岩储层微观非均质性特征，了解微观非均质性与储层致密化的关系，建立储层致密化评价标准，定量评价储层致密化程度.通过铸体薄片、扫描电镜、矿物XRD分析、高压压汞等资料，结合前人研究成果，对盆内东道海子凹陷DN8井区上二叠统梧桐沟组储层进行研究.结果表明，储层微观非均质性包括岩石学非均质性、孔喉非均质性及裂缝非均质性.岩石学非均质性中，岩石结构成熟度差异导致的岩石结构非均质性制约储层的初始物性；砾石、同沉积填隙物中塑性岩屑、胶结物类型及其含量的差异影响储层压实及胶结后的致密程度.溶蚀作用后，成岩-孔隙演化过程差异导致的孔喉非均质性及裂缝发育密度决定的裂缝非均质性影响了储层现今的致密程度.提出以成岩综合指数与地层脆性指数综合表征储层致密化程度，并将致密化程度分为3级.Ⅰ级致密化程度成岩综合指数大于4.0、地层脆性指数大于0.8；Ⅱ级致密化程度成岩综合指数介于3.0~4.0、地层脆性指数介于0.3~0.8；Ⅲ级致密化程度成岩综合指数小于3.0、地层脆性指数小于0.3.Ⅰ级致密储层孔喉结构最好、物性最高、微观非均质性最弱，为研究区有利储层.
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| 关 键 词： | 砂砾岩储层 微观非均质性 上二叠统梧桐沟组 东道海子凹陷 准噶尔盆地 沉积学 |
| 收稿时间： | 2020-07-09 |
Influence Mechanism of Micro-Heterogeneity on Conglomerate Reservoir Densification:A Case Study of Upper Permian Wutonggou Formation in DN8 Area of Dongdaohaizi Sag,Junggar Basin |
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| Cao Jiangjun,Luo Jinglan,Madina Mawutihan,Sheng Weiyan,Mao Qianru,Yang Tao,Di Wenyuan,Song Kunpeng.Influence Mechanism of Micro-Heterogeneity on Conglomerate Reservoir Densification:A Case Study of Upper Permian Wutonggou Formation in DN8 Area of Dongdaohaizi Sag,Junggar Basin[J].Earth Science-Journal of China University of Geosciences,2021,46(10):3435-3452. |
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| Authors: | Cao Jiangjun Luo Jinglan Madina Mawutihan Sheng Weiyan Mao Qianru Yang Tao Di Wenyuan Song Kunpeng |
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| Abstract: | The quantitative evaluation criterion for the conglomerate reservoir was established on the basis of studying the micro heterogeneity characteristics of reservoir, in order to understand micro heterogeneity and quantitatively evaluate the degree of densification for the conglomerate reservoir of the Upper Permain Wutonggou Formation int DN8 area of the Dongdaohaizi sag, eastern Junggar basin, based on identification of blue epoxy resin-impregnated thin sections, analysis of scanning electron microscope (SEM), X-ray diffraction (XRD) of minerals, high-pressure capillary pressure, combined with previous research results. The results show that the micro heterogeneity of reservoir mainly includes petrological heterogeneity, pore throat heterogeneity and fracture heterogeneity. In petrological heterogeneity, the rock structural heterogeneity caused by the difference of rock structural maturity restricts the initial physical property of reservoir. The degree of reservoir densification is affected by types and contents of gravels, cuttings in synsedimentary interstitial matterial and cements after compaction and cementation. The degree of current reservoir densification is affected by the pore throat heterogeneity and fracture heterogeneity, which caused by the difference of diagenesis-pore evolution process after dissolution and the fracture development density. The diagenetic comprehensive parameter (DCP) and formation brittleness index (FBI) are thus put forward to characterize densification degree of the reservoir, which can be divided into three grades. The DCP is greater than 4.0 and the FBI is greater than 0.8 in the first grade of densification. The DCP is between 3.0-4.0 and the FBI is between 0.3-0.8 in the second grade of densification, and the DCP is less than 3.0 and the FBI is less than 0.3 in the third grade of densification. The tight reservoir of the first grade is with the best pore throat structure and the highest quality, thus of the weakest micro heterogeneity, which is the favorable conglomerate reservoir in the study area. |
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