The Evolution Of The Boumdary Fault And The Study Of Time-space Distribution For Bachu In Tarim Basin

Identification,development and evolution of faults are Important factor and content of ascertaining and appraisaling the trap's validity.Bachu area,in Tarim Basin,is One of the most developed areas of fracture,and has abundant oil and gas resources, with deepening the extent of the exploration,hydrocarbon exploration area has expanded.However, Bachu uplift and its surrounding areas affected by multi-periods tectonic movement, geological characteristics are more complex,geophysical exploration degree is lower, drilling fewer and unevenly distributed which lead to an urgent need to answer the question that basic geological features and conditions of hydrocarbon accumulation and in many respects . (etc.)In this paper, on the basis of the present geological, geophysical, seismic, drilling and other Integrated Information,(etc.) Detailed interpretation of seismic and fracture of the evolution as the main support which to analyze the vertical and horizontal distribution of features,describe the typical profile of the boundary faults and analysis its evolution. On this basis, analysis of uplift boundary fault influence on the deposition, the control of post-fault evolution, combined with previous results on the evolution of hydrocarbon,investigate the relationship between hydrocarbon and the boundary faults of uplift.Getting the following main conclusions and understanding:(1).The paper Utilization of fault which on seismic profile,the cut off horizon,the size of the fault displacement, the phenomenon of differences in the thickness of the hanging wall and the foot wall etc. with the evidence of the trace the change of the strike, specific depositional system and facies change, identify a series of the present foundational down fault In the Northern TUMUXIUKE and Selibuya, Hemmi Ross 1, Mazatagenan and a series of reverse faults, that has indicated Bachu uplift experienced multi-periods tectonic movement.(2).Faults distribution,in Bachu area,has the characteristic that plane zonation,block,vertical layering: from west to east, the strike of boundary fault changes from NWW to nearly EW distribution gradually, overall the fault which is To the North protruding arc.(3).According to the analysis for the structure profile evolution and the structure style,Bamai area Division of tectonic evolution pattern of Caledonian early medium-term, early Caledonian to later hercynian, hercynian for advanced, indosinian-yanshanian and Himalayan five stages to propose bachu uplift developed at tiangu uplift's back slopes in early Caledonian and under the control of a large NW trending fossil fracture's inherited tectonics, eventually inherited palaeohigh formed by highly compress and strike slip motion in Himalayan orogeny early-medium term. multi-periods tectonic change the early tectonic style gradually, the Middle Caledonian,Late Hercynian and the MiddleIndosinian are main tectonic process periods.(4).According to the profile's evolution of the main fault as well as the developmental features of the faulting plane in the main active state and by the analyze that compared from the initial development stage of the faulting to its final fixed form:①One form,post-fault is not active;②Early form,post-fault is active again;③Early form,and fault reconstructed;④Early Stretch,and late fault reverse.The faulting active can be concluded by 4 ways and as a basic, the Bachu-faulting model can be dropped.(5).Based on the counting of the difference of the evidences of hydrocarbon between the longitudinal and the horizontal in the Bachu area, the controlling affection of the large scale faulting belt to the oil and gas accumulated and became the mineral reserves can be researched:①the development of the source rock and its thermal evolution were controlled by the large scale faulting belt;②the development of the accumulate facies belt was controlled by the large scale faulting belt;③the trapping types and the throughgoing were controlled by the multi-periods faulting;④the transformation and the conservation of the hydrocarbon were controlled by the multi-periods faulting.(6).Put the development of the tectonic as a clue and to consider from the faulting controls the reservoir, such conclusions can be dropped: the nearly east-west palaeotectonics that developed in the Hercynian or before is the most concentrated area of the hydrocarbon. Besides 3 types of vantage zones were divided.