3D Seismic Acquisition Technology Research For Piedmont Tectonic Belt In Halaalate Mountain

Halaalate mountain located in the Ke-Xia step-fault zone and Halaalate mountain structure ofnorthwestern margin of the Junggar basin, Xinjiang, it is one of the registering mineral rights blockswhich belongs to ShengLi Western new area under Sinopec, it is also a unsuccessful region forexploration although experienced many years exploration.The main structures of this area ispiedmont overthrust nappe tectonic belt,and lie in the same regional tectonic belt with Xia Zi street, Urwo,FengCheng Oil field etc. of CNPC,they have the similar geological background and the conditionsof oil and gas migration accumulation,Under the nappe of concealed trap is the most favorableexploration targets,the accumulation condition is superior and Exploration potential is big.But lowdegree of prospecting and shallow understanding due to technical limitations etc. in the past. so,it isurgent need to develop new3D seismic exploration to obtain new3D stereoscopic data, deepen thegeological understanding,implement the piedmont zone exploration targets in the area,,find a way outfor the oil and gas exploration breakthrough.In recent years, with the help of experience that finds hydrocarbon reservoirs in ShengLi easternmature area.With brand new research angle of view,using frontal slope belt exploration theory as theguidance,proceeding systematic3D seismic acquisition technology methods research and experimentalresearch aiming at piedmont overthrust nappe tectonic belt,and obvious prospecting results have beenachieved.The main works completed Including:(1) collect systematically domestic and overseas existingresearch results for piedmont zone seismic exploration.study the technical status and development trendof seismic exploration about the complex piedmont zone;(2) Geometies analysis argument andevaluation method based on double-complex model is provided,and complete the correspondingtheoretical research;(3) Complete shooting mode partition design with area of703.84square kilometers,and47773shot records,complete dynamite explosion theory and signal scanning theory of vibroseis;(4)Complete geophone receiving and coupling theory research,and special interference wave investigationtest, geophone combination suppressing noise mode test and geophone embedment coupling mode teston site.Obtain mainly four innovation and technical achievements as following:1.3D geometries optimization design method under the condition of double complex model iscreated First proposed based on double complex conditions include the complex surface and near-surfaceand complex underground target structure to build3D model to design evaluate and optimizegeometries, proceed to analysis geometries CRP fold distribution,and proceed to optimize shot andgeophone points and lay-out-change based on “3S” which includes RS,GIS and GPS, establish theCRP analysis process.2. Multi-factor optimization dynamite-vibroseis joint high quality shooting method is providedPartitioned design method of dynamite-vibroseis joint shooting mode is provided, based on“sharding excitation way consistency”,“maneuverability”and “high quality records”three principles torealize shooting mode partitions, Optimal choose shooting conditions and shooting parametersaccording to dynamite explosion theory,design and optimal choose the best scanning parametersaccording to the signal scanning theory of vibroseis,Making their respective most advantage of theshothole charges and vibroseis to realize high quality seismic excitation in piedmont belt..3. Interference wave suppression method and geophone receiving coupling technoloy in piedmontcomplex surface are shapedOptimize parameters and figure of combination to suppress piedmont noise based on the theory ofseismic wave receiving,using special embedment geophone coupling mode to ensure the quality of thecoupling in hard surface.Formed a set of3D seismic data acquisition method and key technology which is suitable forpiedmont overthrust nappe tectonic belt in Halaalate mountain area of northwestern margin of theJunggar basin through the research and practical application research.Using technical methods above, significantly improved the signal-to-noise ratio of seismic data andthe profile accuracy of piedmont overthrust nappe tectonic belt in Halaalate mountain area,as to meetthe requirement of fine interpretation. After new3D seismic data processing and interpretation,Set up Halaalate mountain area overthrust nappe and strike-slip tectonic interpretation model,evaluation of optimization for four favorable exploration zone, implementation of the four types offavorable zones,guide to deploy dozens of well location, and find two new large fields whose name areChunhui oilfield and Arad oilfield both over50Million tons proved reserves.Finally realize the important exploration breakthrough in northwestern margin of the Junggar basinblock,add up newly increased recoverable reserves of7.48million tons,achieve significant economicbenefit of oil and gas exploration,proved that the technologies have the very good promotion andvalue-in-use.