Salt Tectonic Evolution And Its Control On Oil And Gas In The Heroing Ridge Area Of ??the Qaidam Basin

Yingxiongling region in Qaidam Basin rich in oil and gas resources, is the Paleogene-Neogene as the main hydrocarbon source rocks rich region, but also the main producing areas of the Qinghai Oilfield, studying area Paleogene-Neogene sedimentary and tectonic evolution of the region to further deepen the understanding of the formation of structure, evolution and controlling factors of hydrocarbon accumulation, that will play a catalytic role in studying the geological zone of the integrated oil and gas exploration and development. In this paper, a large number of field geological data, seismic data, drilling data, logging data, testing data, combined with the surrounding geology, distribution characteristics of fault Yingxiongling area, tectonic evolution, distribution of gypsum rock, hydrocarbon accumulation characteristics and other conduct study, the following conclusions and understanding:(1) geological structure Yingxiongling area with a double layer structure as the main feature, which can be divided into two structural layers; squeezed influence Altun, by the Kunlun Mountains, the district fracture substantially parallel to the mountain or skewed towards a NW, NWW based; Paleogene-Neogene tectonic evolution has gone through two stages, namely Himalayan off depression early stage and late Himalayan compressive reversal. (2) Western Yingxiongling region "ARON two concave" tectonic pattern, east to "two Ryuichi concave" tectonic framework, a "north-south divide with, something segmented, vertical stratification" feature on the structure, each structure belt with depressions between convergence. (3) On the basis of research on sedimentary characteristics, statistics by drilling, seismic reflection characteristics of the area predicted gypsolith the plane distribution, gypsum rock Yingxiongling area is mainly distributed in the UK West Shizigou-Youyuangou area, longitudinal N1 distributed in the bottom, middle and upper E32, E32 Whole Well some wells have gypsolith exist, well section distributed up to 2400m; NW to the ring on the plane was spread, the thickest central location located substantially lion 36-6 trips to nearby wells. (4) Construction of salt tectonics accumulation mode, basically clear Yingxiongling region salt structures forming characteristics:salt oil symbiosis, gypsum rock and source rocks interbedded source rocks conversion rate; gypsolith for high-quality cap, under normal circumstances, salt overpressure help protect primary porosity reservoirs; multistage vertical communication fault, both on a exogenous reservoir can also be a endogenous seservoir; salt tectonic development of local, usually forming high-yield oil and gas reservoirs.