North-south Structural Belt In Western Sichuan Depression Triassic Trap Efficiency Evaluation

North-south tectonic belt in western Sichuan depression located in the middle of the eastern slope of Western Sichuan Depression, having study area of about 1600km2, the principal in the Wen River-oil and gas exploration blocks in the river, its fault-fold structures are known to bring a new field of development, Shiquan field, Long Po Leung three times a positive structural. Since "Eighth Five-Year", under the Petrochemical headquarters support, Southwest Oil and Gas offices put a lot of exploration and research funding in the area, but now there is not significant breakthroughs in the oil and gas belt. The reason are that mainly north-south structural conditions are very complex and accumulation is not yet in-depth understanding of the geological conditions and evaluation of the effectiveness of the work trap is weak. The effective trap is the key of oil and gas accumulation. The effectiveness of traps becomes more important, especially in the faulting and crushing areas. But there is no special research in this area up to mow, the lack of hydrocarbon accumulation in the area of systemic and holistic assessment. The trap was identificated and descripted by the existing seismic data processing and interpretation techniques in this paper; using of the existing trap evaluation techniques, combined with the characteristics of this zone trap, the effective technology standards of north-south tectonic belt Triassic traps was established; on the basis of theory of natural gas geology, structural geology and sedimentology, I described the characteristics of the target zone trap and analyzed the history of tectonic evolution. On the theory of high-resolution sequence stratigraphy, a major reservoir was fine divided and contrasted by other. The reservoir microfacies, crack distribution, and the reservoir were studied using of sequence stratigraphy, modern geophysical techniques and computer technology. The closure was effectively evaluated to find the most favorable exploration areas on the basis of comprehensive geological knowledge, in order to provide the most important basis for Triassic oil and gas exploration breakthrough and provide direct services for strategic investment decision-making of Sinopec Southwest Oil and Gas Division, and to provide for further exploration of the deployment of exploration targets. The main research content and key results are as follows:(1) North-south tectonic belt having "early high and low, low north to south late," the "seesaw-type" tectonic evolution feature was strongly modified in the Himalayan, which formed in Yanshan.(2) The area of the Upper Triassic hydrocarbon source in the northern and southern region wereâ…¡,â…¢type source rock, respectively. The volume of Triassic in Computing Resources District was 160.535 billion M3.(3) system produced a focus on exploration north-south belt of Upper Triassic sedimentary strata phase diagram that Xujiahe delta front in the industrial area to the main underwater distributary channel deposits, and for the first time identified in the study area southeast direction was an important source of material, during the deposition of Xujiahe.(4) The area of the Upper Triassic Xujiahe reservoir with low porosity and low permeability reservoirs, the pore space between grains and dissolution pores, many cracks and micro-cracks, effectively improved performance of reservoir.(5) By a typical gas reservoir anatomy and drilling study, the effectiveness of the Upper Triassic Xujiahe traps were related to the main conserved conditions and the structural formation of traps, and the configuration of generation and expulsion of hydrocarbon.Through a variety of methods, many major faults of the the region Xujiahe were analyzed and evaluated. The lateral fault sealing of T3x2, T3x3 and T3x5 were better, but the lateral fault sealing of T3x4 were worse. In plane, the northern fault sealing were better than southern.(6) through the structural interpretation, combined with comprehensive research, in the north-south tectonic belt Triassic to the identification and implementation of three structural trap, the total resource of trap was 79.216 billion cubic meters, of which T3x2 was 37.5%, indicating that Triassic mainly distributed in T3x2 strata. Among them, the structure of northern new field and Shiquan were better than the beam structure of southern Longbao, and from south to north gradually changed for the better. According to the characteristics of structural traps, the establishment of the corresponding template of geological evaluation, and then optimizes a favorable exploration target, and put forward proposals of well placement of two drilling well.