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| N油田A油组钙质隔夹层地质特征及成因分析 |
| 廖明光1,2,黄志强1,2,廖纪佳1,2,梁文锋3,张航4,潘柯宇5 |
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(1. 四川省天然气重点实验室, 西南石油大学, 成都 610500;
2. 西南石油大学地球科学与技术学院, 成都 610500;
3. 中海石油 (中国) 有限公司湛江分公司, 广东 湛江 524057;
4. 长江岩土工程总公司 (武汉), 武汉 430010;
5. 西南油气田分公司工程技术研究院, 成都 618000) |
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| 摘要: |
| 在油田开发过程中，隔夹层控制油气水运动规律，对于寻找剩余油具有重要控制作用。本文以N油田TF组2段A油组为研究对象，通过薄片、岩心测试、测井、碳氧同位素等资料综合分析，研究其钙质隔夹层的分布特征、岩石学特征、物性特征、测井识别特征，并从沉积环境、物质来源、成岩作用相结合的角度分析钙质隔夹层的成因。研究表明，A油组纵向上发育的三套钙质隔夹层主要发育在前滨滩坝沉积微相，顶钙与底钙的岩性以砂质生屑质灰岩为主，中钙为钙质砂岩；三套钙质隔夹层中生物碎屑主要以腕足、腹足、有孔虫为主，含少量棘皮、瓣鳃、红藻、介形虫、苔藓虫等；成岩作用主要为胶结作用，胶结物类型包含早期方解石胶结物、中期铁方解石胶结物、晚期铁白云石胶结物；碳氧同位素分析表明，隔夹层中碳主要来自于沉积过程中的海水，同时有少量来自于大气淡水和有机酸，Ca2+主要来源于生物碎屑，其次为钙长石溶解、铝硅酸盐矿物的水化作用。 |
| 关键词: 钙质隔夹层 地质特征 成岩作用 物质来源 |
| DOI：10.19826/j.cnki.1009-3850(2020)01-0026-09 |
| 附件 |
| 投稿时间：2019-10-23修订日期：2020-01-28 |
| 基金项目:国家重点基础研究发展（973计划）项目“中国陆相致密油（页岩油）形成机理与富集规律基础研究冶（编号：2014CB239005）和国家自然科学基金项目“泥质岩层对低渗透砂岩储层油气成藏的控制机理研究冶（编号：41502146）联合资助。 |
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| Geological Characteristics and Genesis Analysis of Calcareous Intercalation Layer of Oil Group A in N Oilfield |
| Liao Mingguang1,2, Huang Zhiqiang1,2, Liang Wenfeng3, Liao Jijia1,2 |
(1. Sichuan Provincial Key Laboratory of Natural Gas, Southwest Petroleum University, Chengdu 610500, China;
2. School of Geoscience and Technology, Southwest Petroleum University Chengdu 610500, China;
3. Zhanjiang Branch, China National Offshore Oil Corporation(China), Zhanjiang 524057, China) |
| Abstract: |
| In the process of oilfield development, the interlayer controls the law of oil and water movement, which plays an important role in controlling the remaining oil. In this paper, the oil group of the second section of the TF formation in the N oilfield is taken as the research object. Through the comprehensive analysis of the thin section, core test, logging, carbon and oxygen isotope, the distribution characteristics, petrological characteristics, physical properties and measurement of the calcareous interlayer are studied. The study shows that three sets of calcareous interbeds are developed vertically in the A oil group. The lithology is mainly composed of terrigenous clastic bioclastic limestone, followed by calcareous quartz sandstone, and the bioclastic is mainly composed of brachiopods and gastropods, with a small amount of echinoderms, foraminifera, flaps and gills, red algae, ostracods, bryozoans, etc. It mainly develops in foreshore beach bar deposits. The diagenesis is mainly cementation, and the cement type includes early calcite cement, medium-term iron calcite cement, and late iron dolomite cement. Carbon and oxygen isotope analysis shows that carbon mainly comes from seawater during deposition, while a small amount of it comes from atmospheric fresh water and organic acid. Ca2+ mainly comes from biological debris, followed by calcium feldspar dissolution and hydration of aluminosilicate minerals. |
| Key words: Calcareous Interlayer Geological Features Diagenesis Material Source |