| 琼东南盆地梅山组泥岩盖层封闭性综合评价 |
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| 引用本文： | 王欢,王琪,张功成,张瑞,郝乐伟,马晓峰.琼东南盆地梅山组泥岩盖层封闭性综合评价[J].西安地质学院学报,2011(2):152-158. |
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| 作者姓名： | 王欢 王琪 张功成 张瑞 郝乐伟 马晓峰 |
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| 作者单位： | [1]中国科学院油气资源研究重点实验室,甘肃兰州730000 [2]中国科学院研究生院,北京100049 [3]中国海洋石油研究总院,北京100027 |
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| 基金项目： | 国家科技重大专项基金项目（2008ZX05025;2008ZX05025-006;2008ZX05025-006-01） |
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| 摘 要： | 通过单井资料统计和沉积相研究,对琼东南盆地梅山组泥岩盖层进行宏观评价,认为盖层岩性以浅海—半深海相泥岩为主,主要发育于北部隆起带与中央坳陷带,侧向连续性好。其最大单层厚度、累积厚度以及含砂量等宏观参数显示,优质泥岩呈现沿北西—南东方向展布的特征。利用测井声波时差和实测岩石样本排替压力之间的关系,计算三亚组一段砂岩和梅山组泥岩的排替压力差,并进行微观评价,认为单井上排替压力差呈凸起高、凹陷低的特点。选取岩性、沉积环境、最大单层厚度、累积厚度、含砂量以及储层与盖层排替压力差作为参数,分别赋予相应的权值和权重,对泥岩盖层封闭性进行综合评价,认为梅山组泥岩盖层综合品质呈规律性变化,表现为北部坳陷低、中部隆起和中央坳陷高的特点,对三亚组发育于北部隆起带周缘的滨海相砂体和发育于中央坳陷带附近的浊积砂体起到了良好的封盖作用。
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| 关 键 词： | 琼东南盆地 梅山组 盖层 封闭能力 排替压力 综合评价 |
Comprehensive Evaluation on the Sealing Ability of Mudstone Caprock in Meishan Formation of Qiongdongnan Basin |
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| Authors: | WANG Huan WANG Qi ZHANG Gong-cheng ZHANG Rui HAO Le-wei MA Xiao-feng |
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| Institution: | 1.Key Laboratory of Petroleum Resource Research,Chinese Academy of Sciences,Lanzhou 730000, Gansu,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China;3.Research Institute of China National Offshore Oil Corporation,Beijing 100027,China) |
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| Abstract: | Based on the single well and sedimentary facies data,the mudstone caprock in Meishan Formation of Qiongdongnan Basin was comprehensively evaluated.The results showed that the lithology of caprock was mainly shallow-bathyal marine mudstone,and the caprock developed in northern uplift belt and central depression,and the lateral continuity was good.The macro parameters,which included the maximum single-layer thickness,cumulative thickness and sandy content,showed that high-quality mudstone distributed along the northwest-southeast direction.Based on the relationship between sonic interval transit time and the displacement pressure of observed rock sample,the difference of displacement pressure between sandstone in the first member of Sanya Formation and mudstone in Meishan Formation was calculated,and the microscopic evaluation was carried out.The results indicated that the characteristic of the difference of displacement pressure was high in the upland and low in the depression for single well.The parameters,which included lithology,sedimentary environment,the maximum single-layer thickness,cumulative thickness,sandy content and the difference of displacement pressure between reservoir and caprock,were evaluated with weight to comprehensively evaluate the sealing ability of mudstone caprock.The results revealed that the comprehensive quality of caprock in Meishan Formation changed regularly;the characteristics were low in the north depression and high in the central uplift belt and central depression;the sealing ability of mudstone caprock for the littoral facies sandbody developed around the northern uplift belt and turbidite sandbody developed around central depression was strong in Sanya Formation. |
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| Keywords: | Qiongdongnan Basin Meishan Formation caprock sealing ability displacement pressure comprehensive evaluation |
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