关键词: 珠江口盆地, 珠三坳陷, 构造演化史, 反转构造, 构造样式, 油气成藏

Abstract: The tectonic evolution history and the sedimentation filling characteristics of Zhu-3 Depression were analyzed.The patterns of inversion structures in this area were recognized,and the reservoir-forming conditions were discussed.According to the patterns of profile structures,the inversion structures were divided into two types of fault correlation and bending folds.The fault correlation pattern was subdivided into the sub-type cap rock on top with normal structure underneath and sub-type reverse fault on top with normal structure underneath on the basis of the different reversal degree of reversal structures.The bending folds pattern was subdivided into sub-type peak in front with trough rearwards and sub-type peak rearwards with trough in front according to the different reservoir-forming reasons.The inversion structures controlled the reservoir-forming conditions.The sub-type cap rock on top with normal structure underneath is the most favorable for oil and gas accumulation.The analysis of Wenchang 19-1 structure in Zhu-3 Depression proved that the inversion structures in the late stage played very important roles for oil and gas accumulation.

Key words: Pearl River Mouth Basin, Zhu-3 Depression, tectonic evolution history, inversion tectonics, structural pattern, oil-gas reservoir-forming