Structure Character Research Of The Daliang Mountain In The Southern Margin Of Sichuan Basin

The sichuan basin and its peripheral areas has always been the key area of oil and gas exploration in China, however, because of the bad geological environment condition factors, such as the light of the regional structure of daliang mountains in the south edge of sichuan basin less research has been extremely evolution characteristics, and current research achievements based on geophysical means more regional characteristics of earthquake distribution or focal mechanism, etc.Based on the above reasons, this article from the regional tectonic deformation characteristics of daliang mountains region, with two structural section across daliang mountains area as the foundation, main structure characteristics, find out the area and follow similar principles, in order to construct sand box by means of physical simulation experiments, the study of its abdomen tectonic evolution characteristics, and finally, from the tectonic style, uplift denudation, regional cap rock condition and the structure of the basin and the mountain four aspects analyzes the oil and gas preservation conditions daliang mountains region,The main results were as follows:(1) The principal stress direction of daliang mountains area of north west- south east to extrusion, the main fault zone of sinistral strike-slip feature, distribution of meigu basin in the study area, ganluo basin, ZhaoJiao basin, is characterized by lower inside basin, basin edge of the high and steep mountain basin.Two section in the study area in evolution experienced three stages:(a)deposit buried heating stage of early to late cretaceous;(b)the end of late cretaceous to the early Cenozoic uplift and denudation stage;(c)late in paleogene, neogene rapid uplift of the early stage of cooling.(2) The Sandbox modeling of strike-slip and extrusion reveals the evolution characteristics of the structure.Roger rydell shear characteristics of early with typical experimental results, show the positive flower structure in section, then makes the structure section by compressional reverse orverthrusting further overlay, the structure of the local early completely destroyed to fuzzy.Using particle image velocimetry(PIV) system to monitor the processing results show that the speed of the sand box surface material field and sand box with high consistency, tectonic deformation and velocity field of constantly adjust and release to explain the regional strike-slip fault zone near earthquakes provides a possibility.(3) Through the study on geologic preservation conditions of oil and gas exploration in the area shows that the area of hydrocarbon source rocks are rich, the development of ginkgo bay group sandstone and argillaceous rock facies distribution temple group and five mountains- argillaceous rock creek group, the dragon affected by multiphase tectonic movement, however, lead to regional cap rocks(cream gypsum layers) had been denudation, coupled with the influence of tongtian fault and failure, make early reservoir may be adjusted and damage, cannot be effectively preserved.