| 文昌A凹陷珠海组砂岩碳酸盐胶结物发育特征及其对储层质量的影响 |
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| 引用本文： | 姜平,王珍珍,邹明生,陈孝君,陆江,尤丽.文昌A凹陷珠海组砂岩碳酸盐胶结物发育特征及其对储层质量的影响[J].地球科学,2021,46(2):600-620. |
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| 作者姓名： | 姜平 王珍珍 邹明生 陈孝君 陆江 尤丽 |
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| 作者单位： | 1.中海石油(中国)有限公司湛江分公司, 广东湛江 524057 |
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| 基金项目： | 国家"十三五"油气重大专项 |
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| 摘 要： | 碳酸盐胶结物是一类砂岩储层中最常见的成岩胶结交代物.厘清碳酸盐胶结物的发育特征、期次及其含量，可定量分析碳酸盐胶结物对储层质量的影响程度.以文昌A凹陷珠海组海陆过渡相砂岩储层的碳酸盐胶结作用为研究重点，分凹陷中心与近珠三南断裂两个主体区域，利用岩石学分析、铸体薄片显微镜下鉴定、阴极发光分析、同位素分析等技术手段，明确了碳酸盐胶结物类型、含量、赋存状态与期次特征，定量分析了碳酸盐胶结作用对储层质量的影响.结果表明，文昌A凹陷珠海组碳酸盐胶结物具有多类型、多期次等典型特征，其在垂向及平面上的分布特征均具较为明显的规律性.碳酸盐胶结减少的孔隙度占比为9.7%~43.0%，平均为20.7%，占全部胶结物减少孔隙的33.6%~88.2%，平均为60.6%；且碳酸盐胶结物对粗粒度岩性的孔隙度影响更大.受断裂带分布及热流体活动影响，碳酸盐胶结物在近南断裂带比凹陷中心更为发育.凹陷中心碳酸盐弱胶结或远离南断裂带区域可作为寻找文昌A凹陷低渗背景下“甜点”储层的有利区带.
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| 关 键 词： | 碳酸盐胶结物 储层质量 成岩作用 孔隙演化 文昌A凹陷 珠江口盆地 石油地质 |
| 收稿时间： | 2019-08-20 |
Development Characteristics of Carbonate Cement and Its Influence on Reservoir Quality in Sandstones from Zhuhai Formation in Wenchang A Depression |
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| Jiang Ping,Wang Zhenzhen,Zou Mingsheng,Chen Xiaojun,Lu Jiang,You Li.Development Characteristics of Carbonate Cement and Its Influence on Reservoir Quality in Sandstones from Zhuhai Formation in Wenchang A Depression[J].Earth Science-Journal of China University of Geosciences,2021,46(2):600-620. |
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| Authors: | Jiang Ping Wang Zhenzhen Zou Mingsheng Chen Xiaojun Lu Jiang You Li |
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| Institution: | (Zhanjiang Branch of CNOOC(China)Co.Ltd.,Zhanjiang 524057,China;PetroChina Dagang Oilfield Branch,Tianjin 300280,China;Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,China) |
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| Abstract: | Carbonate cement is the most common cement type found in the pore space of sandstone.By clarifying the development characteristics,the period and distribution of carbonate cement,the influence mechanisms of carbonate cement on reservoir quality can be quantitatively determined.In this study,the Zhuhai Formation in the Wenchang A Depression was divided into two main sedimentary areas,namely the center of the depression and the area near the Zhu III fault zone.The type,content,occurrence state,stage and distribution characteristics of carbonate cement in the marine-continental transitional sandstone reservoirs of two main areas were analyzed systemically based on core observation,thin sections,cathodoluminescence analysis and carbon and oxygen isotopes respectively.The effect of carbonate cementation on reservoir quality was quantitatively analyzed.Results show that carbonate cements in the Zhuhai Formation have typical characteristics of multiple types and multiple stages.The distribution characteristics of carbonate cement show obvious vertical and plane regularity.The porosity reduced by carbonate cementation accounts for 9.7%-43.0%with an average of 20.7%,accounting for 33.6%-88.2%with an average of 60.6%of the total porosity reduced by cementation.Carbonate cement has a greater effect on the porosity of coarse-grained lithology.Influenced by the distribution of fault zone and thermal fluid activity,compared with the center of depression,the well area near the south fault zone developed more carbonate cement.The area with weak carbonate cementation in the center of the depression,or the well area far away from the South fault zone,can be used as a favorable area to find the"sweet spots"reservoir under the low permeability background in the Wenchang A Depression. |
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| Keywords: | carbonate cement reservoir quality diagenesis pore evolution Wenchang A Depression Pearl River Mouth Basin petroleum geology |
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