鄂爾多斯盆地南部長7段深水沉積特征及沉積模式
[Abstract]:The genetic types and sedimentary models of deep-water sedimentary sandbodies in Yanchang formation in the southern Ordos Basin are controversial, and only one genetic model is used to explain the deep-water sedimentary system. Based on the observation of field profile and some core observations of member 7 of Yanchang formation in southern Ordos Basin, and based on the analysis of sedimentary facies markers, the characteristics and sedimentary model of deep-water sedimentary sand body of member 7 of Yanchang formation in Yanchang Basin are studied in detail. The main conclusions are as follows: firstly, the genetic types of deep-water sedimentary sandbodies in the study area are divided, including storm rocks, sliding rocks, sloughing rocks, sand clastic flow deposits and turbidite deposits, and the identification criteria of various types of deep-water sedimentary bodies are summarized. Secondly, the deep-water sedimentary system in the study area is divided into storm sedimentary system with waterway and slip-slide sedimentary system without waterway development. Storm sedimentary system is divided into watercourse storm rock, channel lateral edge and storm turbidite flower leaf body, which is the cause of storm erosion. The slip-slip system can be divided into sliding rock, sloughing rock, clastic flow tongue body, and distant turbidite deposition, which is caused by earthquakes, volcanoes or storms to trigger the unstable collapse of sediment in the delta front slope break zone. The combination of genetic types and sedimentary models of sand bodies can more intuitively study the assemblage and distribution of sediments in the deep water area of the lake basin and provide theoretical support for oil and gas exploration in the deep water area of the lake basin.
【作者單位】: 中國地質大學(北京)能源學院;
【基金】:國家油氣重大專項(2011ZX05009-002)資助
【分類號】:P618.13
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