摘要:
根据区域地质背景、岩性、古生物、成像测井、地震资料等综合分析,珠三坳陷北部珠海组—韩江组经历了一个海侵逐渐发展的过程,其中珠海组、珠江组二段发育潮坪、海岸平原、小型三角洲,珠江组一段发育滨海、浅海,韩江组主要发育浅海、大型三角洲。珠三坳陷北部珠海组—韩江组形成了3套储盖组合,分别为珠海组、珠江组二段潮坪相砂岩与珠江组一段底部浅海相泥岩所形成的下组合,珠江组一段中、下部滨海相砂岩与珠江组一段上部浅海相泥岩所形成的中组合,韩江组下部三角洲相砂岩与韩江组中部浅海相泥岩所形成的上组合。目前在3套储盖组合中均发现了油层,证实了储盖组合的存在及其储集油气的能力。
Abstract:
The integrated analysis of geological settings, lithological sequences, paleontology, image well logging, seismic, etc. reveals that the sedimentary facies evolution after the faulting stage was a history of marine transgression in the North of Zhu III Depression, the Pearl River Mouth Basin. From the Zhuhai Formation to the Member 2 of the Zhujiang Formation, there are tidal flat, coastal plain and small delta facies; in the Member 1 of the Zhujiang Formation there are offshore and shelf sea facies; in the Hanjiang Formation there are shelf sea and large delta facies; and from the Yuehai Formation upto the Quaternary there are offshore and shelf sea facies. Three reservoir-seal assemblages have been recognized in the area, including: 1) the sandstone reservoir of the Zhuhai Formation and the Member 2 of the Zhujiang Formation coupled with the claystone seal bed of the lower part of the Member 1 of the Zhujiang Formation; 2) the standstone reservoir of the middle and lower part plus the claystone seal bed of the upper part in the Member 1 of the Zhujiang Formation; 3) the standstone reservoir in the lower part and the claystone seal bed in the middle part of the Hanjiang Formation. So far, oil has been discovered in the three assemblages.
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