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珠江口盆地琼海凸起文昌A区 断层侧向封闭性综合评价

作    者:叶 青, 王 猛, 杨朝强, 梁文锋, 甘永年
单    位:中海石油(中国)有限公司湛江分公司
基金项目:受中海油“十二五”重大专项“南海西部海域典型低孔低渗油气藏勘探开发关键技术研究及实践”资助
摘    要:
珠江口盆地文昌A区圈闭类型以断层圈闭为主,断层是油气运移的主要通道,断层封堵性是影响该区断块成藏的主控因素。首先通过Allan图快速评价断层侧向封堵性,结合实际钻井情况分析Allan图的适用性和研究区的断层封闭类型;然后选取影响断层封闭属性的主要参数,断层泥比率(SGR)和泥岩涂抹系数(SSF),依据中新统珠江组二段已钻井圈闭的SGR和SSF数据,结合测井解释成果,建立了SGR-SSF判别图版,定量研究文昌A区断层侧向封堵能力。结果表明:SGR>0.32且SSF≤3.2,断层封堵性相对较好;SGR≤0.25,或SSF>4.2,断层封堵性最差,可排除成藏的可能性;0.25<SGR≤0.32且SSF≤4.2,或SGR>0.32且3.2<SSF≤4.2,参数范围落在未经钻井证实区域,具有一定的成藏潜力。据此图版对文昌A区E1断块和W1断块珠江组二段高部位的断层封堵性进行分析,认为E1断块ZJ2-3U、ZJ2-3M、ZJ2-3L、ZJ2-4U油组高部位的断层封堵性相对较好,W1断块ZJ2-1L、ZJ2-3U、ZJ2-3L、ZJ2-4U油组高部位的断层封堵性较好,是下一步油气勘探的有利区。
关键词:珠江口盆地; 琼海凸起; 珠江组; 断层侧向封闭; 评价

Comprehensive evaluation of fault lateral sealing ability in Wenchang A area, Qionghai Swell, Pearl River Mouth Basin

Author's Name: YE Qing, WANG Meng, YANG Zhaoqiang, LIANG Wenfeng, GAN Yongnian
Institution: CNOOC Zhanjiang Company
Abstract:
Fault sealing is the main factor of hydrocarbon accumulation in Wenchang A area, Pearl River Mouth Basin, where faulted traps developed. The Allan map is used to quickly evaluate the lateral sealing property of the faults, and with the actual drilling results, the applicability of the Allan map and the type of fault sealing are analyzed in the study area. It is shown that the Allan map can’t completely evaluated the lateral sealing character. Then the main parameters, SGR and SSF, are selected to setup SGR-SSF discrimination chart for quantitative study. According to seismic interpretation, SGR and SSF of the faults related to the drilling traps in Member-2 of Miocene Zhujiang Formation are obtained, and the SGR-SSF discrimination chart is set up combined with logging results of oil and water. It is shown that when SGR>0.32 and SSF≤3.2, the fault sealing property is relatively good; when SGR≤0.25, or SSF>4.2, it is the worst, with little possibility of oil accumulation; when 0.25<SGR≤0.32 and SSF≤4.2, or SGR>0.32 and 3.2<SSF≤4.2, it is in the unproven area, with a certain potential. According to the charm, the lateral sealing feature of faults in E1 and W1 blocks of Wenchang A are analyzed. It is proved that the oil formation of ZJ2-3U、ZJ2-3M、ZJ2-3L、ZJ2-4U in high position of E1 block, and ZJ2-1L、ZJ2-3U、ZJ2-3L、ZJ2-4U of W1 block are relatively good in fault sealing condition, which could be the favorable targets for further exploration.
Keywords: Zhujiang Formation; fault lateral sealing; evaluation; Qionghai Swell; Pearl River Mouth Basin
投稿时间:2017-11-30  
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