The Characteristics In The Middle Of Longmen Mountain Thrust Belt And Hydrocarbon Accumulation Conditions

Longmen Shan thrust belt in the west of Sichuan Basin, Yangtze platform and thequasi-Songpan-Ganzi fold belt line, the main NE-SW to a large structural zone, thenumber of NE, north-south and a little composition of the NW and fracture, structuralfeatures of complex and changeable. Belt from south to north with the segmentation,respectively, the southern section of Longmen Mountain, the middle, the northernsection; from west to east with the zoning, four different large-scale fault controlledstructural deformation zone, which is constructed from west to east divided into zone,the main Longmenshan-imbricate thrust belt, the former mountain belt-LongmenMountain thrust fault-fold belt front, piedmont cover band-gently fold belt. LongmenMountains outcrop with features, the interpretation of seismic profiles andunderstanding the many predecessors. It is from this paper to discuss tectonics as astarting point, from the structure of the kinematics, geometry and dynamics and otherfactors discussed before the middle of Longmen a combination of structural style anddistribution, while in the analysis, basin-mountain coupling dynamics, structure theimpact of evolution of the role of oil and gas, based on the middle front of theLongmen structural features and hydrocarbon reservoir conditions.Longmen Shan thrust belt experienced a number of times, polycyclic tectonicmovement formed the face of today’s complex structure, and its tectonic movement iscrucial: early Indo-China movement, County movement, the late Indo-Chinamovement, Yanshan Sports and Himalayan movement, movement and Himalayanmovement County which is particularly important. According to basin-mountaincoupling point of view, the formation of orogenic foreland basin prerequisite.Longmen County area sports to the regional stress field from the NE-SW to squeezeinto the North West-South East, to squeeze, so that the Longmen Shan thrust occurs, the formation of the Longmen Shan thrust nappe with the latter by inheritance anddevelopment of Yanshan period, the early and mid-Himalayan fold-thrust nappedevelopment, advanced gliding nappe formation, and gradually formed the presentcomplex structure.Subject to the Piedmont from the Longmen with the direction of the intensity ofdeformation gradually weakened, the previous expansion extended thrust beltextension order. Longmen structural styles in the plane before the middle that haszoning, has a layered profile of. Development as the main structural styles: imbricatethrust structures, the double structure, klippe construction, belt structural style, faultfolds, fault bend folds, reverse thrust, tectonic processes and so on. Paper describesthe structural style and profile in the plane on the distribution law.Longmen complex before the middle of the structural style and tectonic activitymore than the decision of the times the area of oil and gas distribution andcharacteristics of the typical traps as early as late poly possession type. Himalayantectonic movement of the reservoir storage conditions, the final shape of the structuralstyle of trap has a decisive role in the preservation of reservoir conditions dependslargely on the performance of fault sealing by sealing the research, combined withlong dark1well drilling results, shows that its leading edge in the Longmen Mountainthrust fault is developed above the sliding surface, strata severely damaged, Tongji cutthrough the Triassic and the fracture site, cut to the surface is not conducive to thepreservation of gas, do not have the oil and gas aggregation conditions. But before themiddle of Longmen rich oil and gas resources, exploration potential, and found theformer mountain belt such as gas PINGLUOBA, but further exploration ofbreakthrough small degree. Ability to obtain oil and gas production in the area,geologists have been puzzled and oil exploration units and to address the problem.This study attempts on the basis of the previous work, through the determination ofstructural features and style as well as the evolution of structural analysis, divided intodifferent strata, different times and in different structures, combined with the localtectonic evolution of key blocks come on the conditions of hydrocarbon accumulationas a basis of the favorable zone to be divided, and predicted target structure has beenachieved in some oil and gas results better, through a comprehensive evaluation of thefavorable exploration area, with a good display of the exploration prospects.