| Foreland basin has been one of the hot spot of oil and gasexploration in west of Sichuan. In recent years, Many famous geologicalscholars have been researching basin in west of Sichuan,and got a lot ofvaluable results, all this effectivlly guided the basin exploration in oil andgas of western sichuan. Since the discovery of Fengshunchang structural,although predecessors had explored,it’s still lack further researches ofstructure and accumulation conditions. The form of abdominal structurein Fengshunchang have evident differences with the surface ground, thetectonic pattern are basically consistent from shallow to deeper, fracturedevelopment,and the tectonic deformation is more complex. This paper iscomprehensive analysis the Fengshunchang structural style and structuralevolution deformation by study it’s the structure of the kinematics, geometry and dynamics of the factors as a starting point,furtherconfirmed the Fengshunchang’s tectonic characteristics,It hasidentificated controls by the tectonic on oil and gas accumulation, notonly advantage to the study of oil and gas exploration in the work of thedeployment and development, it also has important role to reduce theexploration risk in the instruction.This paper is basicly on the comprehensive summary onpredecessors’ achievements, according to Longmenshan researchconditons,by the earthquakes, drilling, logging data as foundations, by thetectonic geology, the petroleum geology of sedimentation as theory ofguidances, using the seismic data interpretation fine structure technologyand oil and gas basin structure analytical technology,based on earthquakeinterpretation results, using the structure simulation experiment, make aevaluation on favorable area of Fengshunchang. Main known as follows:1) Through the research of geological datas and seismic datas, theFengshunchang field mainly appears as large fold, reverse anticlinedevelopment stack, detachment structure, abdomen, fold structuredevelopment hedge tegular structure and dual structure tectonic style.2) Through the analysis of the surface geological characteristics、fracture displacement loss and transfer mechanism and characteristics ofslippage layer system, and so on, then appling the corresponding tectonic style to the structural analysis, we have eastblished Fengshunchangstructure of tectonic geology model.3) Through the comprehensive interpretation of earthquake geology,found that the Fengshunchang structure is formed from Himalayan periodextrusion action under thick skin structure, the main body structureabdominal maple field from south to north, the evolution of the structureby hedge of watts shape structure, appear most north of the dual structure.As we know, the longmen mountains north the Himalayan period ofdeformation of the northern strength greater than in the south, the tectonicprincipal stress from north west.4) Through the4times structure physical simulation experiments,preliminary confirmed the area of Fengshunchang which formed inIndo-Chinese epoch of thin skin structure is affected by compressionalstress and north west-south east to gravity slippery role in the formationof the common; The Fengshunchang structure has more than one slippageformations, detachment layer formation and layered deformation, verticalbuy unharmonious contraction of tectonic deformation.5) Although Fengshunchang structure have a maple large structuraltrap, the fault exposed surface, preservation conditions is poorer. And atthe end of Triassic is a massive oil and gas generation period, but printeda late tectonic movement in front of longmen mountains form by thestructure, a large number of the exposed fault surface, is not conducive to the preservation of the oil and gas. Moreover, the Fengshunchangstructure in Himalayan period of the formation of the structural trap, andat the end of the Triassic period of the generation of oil and gas does nothave the good the matching relation, thus the Fengshunchang structureexploration risk is bigger. |
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