四川盆地川西地区雷口坡组岩溶储层特征与分布
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摘要
四川盆地雷口坡组发育一套碳酸盐台地相沉积,形成滩相白云岩和岩溶风化壳两类储层,均在川西地区获得了重要发现,如中坝气田、新场气田等,是目前四川盆地三叠系勘探的重要领域。为了明确川西地区雷口坡组与上覆地层的分界线,以及雷口坡组岩溶储层的特征与分布,开展了相关研究。分析认为,川西地区雷口坡组与上覆马鞍塘组存在4种接触关系,通过露头、岩心、薄片、测井和地震等多种资料重新厘定了雷口坡组与马鞍塘组的分界线,认为雷口坡组顶部存在明显的暴露特征,发育风化壳和岩溶储层,而马鞍塘组属于较深水开阔台地沉积,白云岩不发育,且后期未暴露地表。雷口坡组岩溶储层分布受控于该组顶部暴露地层岩性和古地貌特征,利用井震结合的方法预测优质储层主要分布于川西中南部,但储层非均质性和相带变化较大。根据优质储层与烃源岩匹配关系,指出下一步勘探的有利区带位于川西南部地区。
The Leikoupo Formation in the Sichuan Basin developed carbonate platform deposits represented by shoal dolomite and karst reservoirs. Important discoveries have been made in the western Sichuan Basin, such as the Zhongba gas field and the Xinchang gas field, it is the important target for Triassic gas exploration in the Sichuan Basin. Researches have been carried out to clarify the boundary between the Leikoupo Formation and the overlying Ma'antang Formation and the characteristics and distribution of the karst reservoirs in the Leikoupo Formation in the western Sichuan Basin. The results found 4 types of contacts. According to the outcrops, cores, thin slices, logging and seismic data, the boundary between Leikoupo Formation and Ma'antang Formation is redefined: Leikoupo Formation developed weathering crust and karst reservoirs which indicate an exposed environment. While Ma'antang Formation developed deep water deposits without dolomite and exposed top. Controlled by the exposed top and the paleogeomorphology, well-seismic data predict that good reservoirs are distributed in the central and southern parts of western Sichuan Basin, with strong heterogeneity and changing facies. Future exploration targets are proposed in the southern part of the western Sichuan Basin with the relation between the sources and the reservoirs.
The Leikoupo Formation in the Sichuan Basin developed carbonate platform deposits represented by shoal dolomite and karst reservoirs. Important discoveries have been made in the western Sichuan Basin, such as the Zhongba gas field and the Xinchang gas field, it is the important target for Triassic gas exploration in the Sichuan Basin. Researches have been carried out to clarify the boundary between the Leikoupo Formation and the overlying Ma'antang Formation and the characteristics and distribution of the karst reservoirs in the Leikoupo Formation in the western Sichuan Basin. The results found 4 types of contacts. According to the outcrops, cores, thin slices, logging and seismic data, the boundary between Leikoupo Formation and Ma'antang Formation is redefined: Leikoupo Formation developed weathering crust and karst reservoirs which indicate an exposed environment. While Ma'antang Formation developed deep water deposits without dolomite and exposed top. Controlled by the exposed top and the paleogeomorphology, well-seismic data predict that good reservoirs are distributed in the central and southern parts of western Sichuan Basin, with strong heterogeneity and changing facies. Future exploration targets are proposed in the southern part of the western Sichuan Basin with the relation between the sources and the reservoirs.
引文
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