Non Anticline Trap Identification And Gas Detection In East Of Yuqi Area In Tahe Oilfield

3D seismic area of east of Yuqi is located in the northeast of Akekule arch in Tarim Basin.The area belong to low degree of exploration,deploying 9 wells in tectonic traps in the southern area.The effect of clastic rocks is not ideal.In carbonate formation only YQ8 and YQD1 wells in the Ordovician after acid refracturing wells get industrial gas flow,while YQ12 getting low flow.The area under the direction of further exploration in predicament.Based on the analysis of the structure,sedimentary and hydrocarbon source rocks in this area,it is considered that although the source rocks are not developed in this area,the Manjiaer depression in the south of the area provides a good oil and gas injection conditions.Through the numerical simulation of the well YQ10 and analysis of fluid inclusions in the Ordovician eastern area exists that odd multiple hydrocarbon charging.The main accumulation period in the late Himalayan period,oil and gas filling of the Ordovician strata and overlying strata provide good conditions for accumulation.In order to achieve in the area of clastic rocks in east of Yuqi oil and gas breakthrough,improving the drilling accuracy it’s necessary to detect gas of the strata.This thesis is based on the seismic data and drilling data,combined with regional tectonic and sedimentary characteristics using 3D seismic frequency energy attenuation technology of Ordovician and its overlying Devonian and Triassic layer of gas bearing detection,and trap analysis.Frequency energy attenuation technology is based on Fourier transform turning east of Yuqi 3D seismic data into 5Hz,10Hz,15Hz,20Hz,25Hz,30Hz discrete energy data body to detect gas on the target layer.In the lower middle Ordovician carst gas-bearing properties of YQ8,YQ12 two wells consistent with the abnormal of the frequency division energy attenuation.It’s showed that frequency division energy attenuation in the prediction of gas reservoir has a certain reliability in this area.According to the different of overlying strata and different periods influence of Karst divided the lower middle Ordovician into three regions,combined with frequency division energy attenuation and development characteristics of the karst thought that II,III area Ordovician carbonate rock oil gas prospect better than I area.Devonian DongHeTang formation and Triassic up oil group detected gas anomaly,combining sedimentary and tectonic features thought that donghetang formation overlap in T70 and T74 unconformities on sandstone updip trap,the reservoir,trap,migration and preservation conditions are more reliable.The Triassic oil group is a sandstone fault block controlled by thrust fault,because the upper dip fault and lateral fault of oil reservoir are not intersected in the work area.