川西前陆盆地上三叠统马鞍塘组生物礁的研究和预测

摘要

通过对川西北上三叠统马鞍塘组生物礁野外露头的研究,认为其为深水硅质海绵礁,处于水体较深的环境,根据生物礁序列发育模式,向礁区东侧水体较浅处可能发育浅水生物骨架礁和滩.通过川西坳陷地震剖面的详细解释和研究,在该套层位发现疑似礁型的丘状体,丘状体底部连续强反射同相轴,内部杂乱反射或无反射和顶面披盖式反射说明其为生物礁的可能性很大.目前川西坳陷勘探层位最深为须家河组,这些连带发育的似礁型丘状体对于向较深层勘探具有重要意义.%The research on Ma'antang reef exposure in Upper Triassic finds out that there should be siliceous sponge reef in deep water. According to reef developing sequence model, in the east part of work area where the water is not deep, there should be suitable place for framework reef development. By seismic intensive interpretation and research, hummocky is found in layer, and probablely the reef. The bottom of hummocky with strong-successive phase axis shows non or clutter reflection inside. The top of hummocky presents drape like reflection. All reflection characters above show that it should be the real reef. Nowadays, the deepest layer in west Sichuan depression exploration is Xujiahe formation, looks like reef, with important meaning for the exploration in deeper layer.