| 恩平凹陷恩平组下段成岩过程分析与储层动态评价 |
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| 引用本文： | 禚喜准,王琪,陈国俊,李小燕,张胜斌.恩平凹陷恩平组下段成岩过程分析与储层动态评价[J].沉积学报,2008,26(2):257-264. |
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| 作者姓名： | 禚喜准 王琪 陈国俊 李小燕 张胜斌 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所兰州油气资源研究中心 兰州 730000; 2.中国科学院研究生院 北京 100039 |
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| 基金项目： | 中国科学院知识创新工程项目
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国家重点基础研究发展计划(973计划)
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中国科学院"西部之光"人才培养计划 |
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| 摘 要： | 恩平凹陷恩平组下段现今埋深超过3 800 m，处于中成岩B期，客观评价恩平组下段的勘探潜力及有利目标是深入勘探的重要前提。通过大量铸体薄片、普通薄片、扫描电镜等分析，划分了恩平凹陷恩平组的成岩序列，找出了影响储层物性的主控成岩作用，认为压实作用是孔喉衰减的主导因素，有机酸性流体溶蚀作用是孔隙度局部回升的主要原因。根据恩平凹陷埋藏史、地热史、成岩过程分析建立了恩平组的孔隙度演化模式，在关键时期恩平组下段处于中成岩A期的晚期，该时期的古孔隙度平均值约10%，孔喉已经比较细小，不利于酸性流体的改造和油气的大量充注。在上述工作的基础上，运用沉积相、成岩相结合的方法对恩平组下段储层进行了动态评价，处于凹陷南斜坡的PY14 5 1井附近地区压实较弱，物性较好，是油气运聚的有利区带，其它地区成岩强度较高，只能作为天然气勘探的目标。
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| 关 键 词： | 古孔隙度 古成岩强度 成岩序列 成岩过程 关键时期 |
| 文章编号： | 1000-0550(2008)02-0257-08 |
| 收稿时间： | 1900-01-01 |
| 修稿时间： | 2007年4月21日 |
Analysis of Diagenetic Process and Dynamic Reservoir Assessment on the Lower Part of Enping Fm., Enping Sag |
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| ZHUO Xi-zhun,WANG Qi,CHEN Guo-jun,LI Xiao-yan,ZHANG Sheng-bin.Analysis of Diagenetic Process and Dynamic Reservoir Assessment on the Lower Part of Enping Fm., Enping Sag[J].Acta Sedimentologica Sinica,2008,26(2):257-264. |
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| Authors: | ZHUO Xi-zhun WANG Qi CHEN Guo-jun LI Xiao-yan ZHANG Sheng-bin |
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| Institution: | 1.Key Laboratory of Gas Geochemistry, Chinese Academy of Sciences, Lanzhou 730000; |
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| Abstract: | The depth of the lower part of Enping Fm.,Enping Sag is over 3 800 meters now,and the intensity of diagenesis is at the B period of middle diagenetic stage.Of course,it is a basic task that the lower part of the Enping Fm.is assessed objectively.Based on the numerous observations on thin sections and SEM analyses,the diagenetic sequences of Enping Formation,Enping Sag has been created.Also,we have found out the main controlling diageneses that affect the reservoir property strongly:first,compaction is the key factor that results in the reduction of porosity;second,the denudation of the acid fluid is the main reason that causes the enhancement of porosity partly.Through the analysis on the burial history,geothermal history,and diagenetic process,the porosity evolutionary model of Enping Formation could be built.At the crucial moment,the lower part of the Enping Formation was at the late A period of the middle diagenetic stage,its mean porosity was 10% or so.At the moment,the pore throats were so narrow that the acid fluid and the oil were hard to be injected in.On the basis of all data above-mentioned,we dynamically assessed the reservoir of Enping Sag using diagenetic facies in combination with sedimentary facies.The area in the vicinity of the Well PY14-5-1 located in the south slope of the sag is less compacted,so the physical property is better than anywhere else.The area nearby the Well PY14-5-1 is the important destination of oil and gas,but the diagenetic intensity of the other areas is very high,so there is only fit for gas prospecting. |
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| Keywords: | paleo-porosity paleo-intensity of digenesis diagenetic sequences diagenetic process crucial moment |
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