廊固凹陷万庄构造薄砂岩储层预测

Prediction of thin-sandstone reservoir in Wanzhuang structure of Lang-Gu depression.

薄砂岩储层是隐蔽油藏勘探的重要领域之一。廊固凹陷万庄构造沙三中段发育扇三角洲砂体,且邻近生油洼槽,有利于岩性油藏的形成。但由于砂层厚度较薄,横向变化较快,造成砂体预测不准,岩性圈闭落实困难。为此,本文采用高精度地震反演、频谱成像和储层检测等一套储层综合预测技术,精确刻画了薄砂体的展布、空间形态,查清了储层发育区,发现并落实了一批有利的岩性圈闭。根据本次综合储层预测成果部署的5口井均钻遇较厚油层,进而发现和证实万庄构造是一个具有千万吨级的整装规模的储量区。

Thin-sandstone reservoir is one of important realm of subtle reservoir exploration. The fan delta sand body developed in middle segment of ES3 of Wanzhuang structure in Lang-Gu depression is adjacent to oil-generating sag, which is of benefit to form the lithologic reservoir. But the thin thickness of sand beds and their rapid lateral variation resulted in incorrect prediction of sand body and difficult definition of lithologic traps. For that reason, The paper used a set of integrative reservoir prediction techniques such as high-precision seismic inversion, spectrum imaging and reservoir detection, preciously described distribution and spatial configuration of thin sand body, clarified developed zone of reservoirs and discovered and defined a lot of prospective lithologic reservoirs. The thick oil-bearing formations have been found in de-ploied 5 drilling wells based on the reservoir-predicted results from this integrative method, which further discovered and proved that Wanzhuang structure is complete 107 tons-rank reserve zone.