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上三叠统马鞍塘组是四川盆地西部地区最后一套海相碳酸盐岩地层,其中发育的礁滩等沉积微相是油气勘探的有利相带。为了探讨马鞍塘组滩、生物礁及礁滩组合的发育及分布情况,通过对比分析有关的钻井和野外资料,发现马鞍塘组厚度、岩性和沉积特征等在短距离内横向变化较大;新发现在孝泉—汉旺地区马鞍塘组底部发育有一北西向的砂屑滩;川西坳陷中部晚三叠世卡尼期的沉积相主要为同斜缓坡中的砂屑滩、鲕粒滩、生物碎屑滩和生物礁微相。除砂屑滩外,鲕粒滩、生屑滩和生物礁(点礁)微相都沿龙门山呈北东向发育,卡尼期末的沉积相为滨海潮汐相。
The Upper Triassic Ma’antang Formation is the last set of marine carbonate rocks in the western Sichuan Basin. The developed reef banks and other microfacies are favorable facies belts for oil and gas exploration. In order to explore the development and distribution of the beach reef and reef-shoal assemblage in the Ma’antang Formation, by comparing the relevant drilling and field data, it was found that the thickness, lithology and sedimentary characteristics of the Ma’antang Formation varied greatly in a short distance. The discovery of a northwesterly sand littoral at the bottom of the Ma’antang Formation in the Xiaoquan-Hantang area newly discovered. The late-Triassic Carneyian sedimentary facies in the central western Sichuan depression mainly consisted of sandy littoral and oolitic beaches , Bioclastic beaches and reef microfacies. In addition to sand and litter, oolitic beach, bioclastic beach and reef (reef) microfacies all developed along the Longmen Mountains to the north-easterly direction, and the sedimentary facies at the end of the Carney period was the coastal tidal phase.