| 碳酸盐岩储集层成岩作用中“孔隙尺寸控制沉淀”研究进展、地质意义及鄂尔多斯盆地实例* |
| |
| 引用本文： | 熊鹰,谭秀成,伍坤宇,王小芳.碳酸盐岩储集层成岩作用中“孔隙尺寸控制沉淀”研究进展、地质意义及鄂尔多斯盆地实例*[J].古地理学报,2020,22(4):744-760. |
| |
| 作者姓名： | 熊鹰 谭秀成 伍坤宇 王小芳 |
| |
| 作者单位： | 1.油气藏地质及开发工程国家重点实验室·西南石油大学,四川成都 610500;2.中国石油天然气集团有限公司碳酸盐岩储层重点实验室西南石油大学研究分室,四川成都 610500;3.德国克劳斯塔尔工业大学地下能源系统研究所,克劳斯塔尔 38678;4.中国石油杭州地质研究院,浙江杭州 310023 |
| |
| 基金项目： | *国家科技重大专项(编号: 2016ZX05004002-001,2016ZX05004006-001-002)和中石油科技项目(编号: 2019B-0406)联合资助 |
| |
| 摘 要： | 基于碳酸盐岩储集层成岩作用中受孔隙尺寸控制的矿物沉淀和胶结非均质特征的发现与思考,结合当今国内外有关多孔介质中流体—岩石相互作用及化学流体动力学研究进展的调研,对相关研究进展及其地质意义进行了简单的梳理和归纳。(1)地质环境中“孔隙尺寸控制沉淀”现象广泛存在,表现为储集层孔隙的胶结非均质性及其最终形成的“大孔充填而小孔保存”特征。现今研究主要从不同尺度孔隙结构观察、流体—孔隙介质相互作用的数值模拟、矿物沉淀实验3个方面开展。(2)受孔隙尺寸控制的非均质沉淀特征可以利用与表面化学相关的动力学模型进行解释,即微孔隙中更大的界面张力和矿物晶体曲率导致矿物的有效溶解度更高,因而更容易保持过饱和状态而不发生沉淀。(3)“孔隙尺寸控制沉淀”现象可使油气储集层发生微孔的选择性保存,在不同尺度孔隙共生的情况下,较大孔隙更倾向于被胶结充填而小孔则更易于被保存,不同的胶结模式对岩石整体渗透率的影响略有不同;该现象在地热储集层开发和二氧化碳地质封存研究中也值得重视。最后,结合鄂尔多斯盆地马家沟组碳酸盐岩储集层的非均质胶结特征和孔隙分布,分析总结成岩流体性质、来源及胶结模式差异对孔隙结构演化和优质储集层分布的影响。“孔隙尺寸控制沉淀”现象的发现和重视对于理解流体—岩石复杂作用过程具有重要理论意义,也为储集层成岩作用和孔隙保存研究提供了新的视点和思考角度。
|
| 关 键 词： | 孔隙尺寸 胶结非均质性 成岩作用 过饱和流体 孔隙保存 |
| 收稿时间： | 2020-03-09 |
Research advances,geological implication and application in Ordos Basin of the “pore-size controlled precipitation” in diagenesis of carbonate rock reservoir |
| |
| Sheng Hui,Duan Zheng-Ming,Liu Shan-Wei,Zeng Zhe,Feng Jian-Wei.Research advances,geological implication and application in Ordos Basin of the “pore-size controlled precipitation” in diagenesis of carbonate rock reservoir[J].Journal of Palaeogeography,2020,22(4):744-760. |
| |
| Authors: | Sheng Hui Duan Zheng-Ming Liu Shan-Wei Zeng Zhe Feng Jian-Wei |
| |
| Affiliation: | 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;2.Southwest Petroleum University,Division of Key Laboratory of Carbonate Reservoirs,CNPC,Chengdu 610500,China;3.Institute of Subsurface Energy Systems,Clausthal University of Technology,Clausthal-Zellerfeld 38678,Germany;4.PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023,China |
| |
| Abstract: | Based on the discovery of pore-size controlled mineral precipitation and cementation heterogeneity in carbonate rock reservoirs,the state of art and the geological implications are summarized,referring to the fluid-rock interaction and chemical hydrodynamics in porous media. (1)The pore-size controlled precipitation phenomenon is common in geological environments,as shown by the heterogeneous cementation and eventual features that the large pores are filled while small pores can be preserved. Related studies are mainly divided into three aspects,including pore structure observations at different scales,numerical simulation of fluid-rock interaction and mineral precipitation experiment. (2)The kinetic models related to surface chemistry can be used to explain the heterogeneous precipitation affected by pore-size distribution. The larger interfacial tension and mineral crystal curvature in the micropores result in the much higher effective solubility.Thus the fluids in micropores can maintain a higher supersaturation with no minerals precipitation. (3)The pore-size controlled precipitation leads to the selective preservation of micropores. It means that the much larger pores tend to be cement-filled while the smaller pores are preserved in the case of coexistence of pores at different scales. The impacts of cementation types on the overall permeability of rock are different. The pore-size controlled precipitation phenomenon is also worthy of attention in the research of geothermal development and geologic sequestration of carbon dioxide. In the last part, based on the heterogeneous cementation and porosity distribution of the Majiagou Formation in the Ordos Basin,we study the impacts of diagenetic fluids properties,origin and cementation patterns on the evolution of pore structure and high-quality reservoir distribution.The discovery and emphasis of pore-size controlled precipitation is of great theoretical significance to our understanding of the complex fluid-rock interaction process,which provides a new perspective for reservoir diagenesis and pore preservation. |
| |
| Keywords: | pore-size cementation heterogeneity diagenesis supersaturated fluid pore preservation |
|
| 点击此处可从《古地理学报》浏览原始摘要信息 |
|
点击此处可从《古地理学报》下载全文 |
|
