Application of Full Formation MicroImager (FMI) on Study of the Nearshore Subaqueous Fan Sedimentary Characteristics

Taking the nearshore subaqueous fan's glutenite of sha-4 member of Yan-22 block in the north steep slope of Dongying sag as an example, a series of work has been done to reveal the rock types, sedimentary structures and sedimentary micro-facies of glutenite on the basis of FMI log, combining with core analysis and conventional log. The results show that the glutenite can be divided into 5 rock types, including middling-coarse conglomerate, fine conglomerate, pebbled sandstone, sandstone and mudstone. And 9 typical sedimentary structure are identified, including horizontal bedding, parallel bedding, cross bedding, massive bedding, graded bedding, load cast and flame structure, convolute structure, slump structure and sand pillow structure. Further according to the syntagmatic relation of lithology and sedimentary structure, the nearshore subaqueous fan can be classified into 8 sedimentary micro-facies, including main channel, lateral margin of channel, braided channel, braided channel front, inter -braided channel, incised channel, terminal sand and outer fan mud.