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等深积岩丘大量存在干现代海洋调查和古代地层记录的深水沉积中,其规模可与深海大型浊积扇相比拟。岩性一般由泥级、粉砂级、砂级及细砾级等深漉沉积构成,成分上可以是陆源碎屑的或是碳酸盐的,其中粉砂级和砂级等深流沉积的单层厚度在数厘米至数十厘米,厚者可达2m 左右。颗粒的分选性一般中等一较好,局部很好,原生孔隙发育,并与深水原地沉积的页岩、泥岩互层沉积,具有良好的生储盖组合特性。对比了大西洋东缘现代沉积的 Faro 等深积岩丘和中国古代奥陶纪沉积的湘北九溪等深积岩丘、甘肃平凉等深积岩丘的层序特征,提出了等深积岩丘的形成分为萌生、成型和衰退三个阶段的沉积模式。认为等深积岩丘具有潜在的油气勘探前景。
In many deep-seated mound, there are many modern marine surveys and deep-water sediments recorded by ancient strata, which can be compared with the large turbidite fan in the deep sea. Lithology generally muddy level, silt level, sand grade and fine gravel grade deep Lu sedimentary composition, composition may be terrigenous clastic or carbonate, in which silt level and sand level and other deep-flow deposition Monolayer thickness of several centimeters to tens of centimeters, thick up to 2m or so. Particle sorting generally moderate better, locally very good, native pore development, and in-situ deposition of shale, mudstone interbedded, with a good reservoir-cap combination characteristics. Comparing the sequence features of the deep sedimentary rocks such as the Faro and other sediments in the eastern margin of the Atlantic Ocean with the deep-seated rock mounds in the northern part of the Xiangxi reservoir such as the Jiuxiu and the Pingliang deposits in the ancient Ordovician in China, The formation is divided into three stages of initiation, forming and decay deposition pattern. It is considered that the isoprofti mounds have the potential prospect of oil and gas exploration.