Tectonic Characters And Their Dominancy In Hydrocarbon Accumulation At Complicated Faulted Area: A Case Study At Gucheng-gaozhuang Block, Biyang Depression

After almost three decades of exploration and development, Biyang depression which is the "small and fat" oil-rich depression in the eastern rift basin in china, has entered a high mature stage of exploration. The past two years, with heavy-ultra-heavy oil thermal recovery pilot in the north of Biyang Depression made some progress, the exploration and development of gucheng - gaozhuang area is also put on the agenda; therefore, studying the construction and oil control role of complex fault zone and predicting a lower favorable exploration target zone become the main contents of this paper.The new three-dimensional seismic data which was collected in 2007 provides the material basis with the detailed exploration for the complex fault-block. First of all, the horizon is explained by using the three-dimensional structural interpretation, the interpretation of three-dimensional visualization, wearing alley profile verification closure and other technical means, small faults are finely resolved by using transformation display function, a continuous multi-line contrast, post-stack processing, wearing alley profile and other methods which are concluded, and the relationship between faults cutting in the complex fault zone is streamlined and the gucheng region's complex structural outlook is reasonably dissected through a variety of techniques and methods. Second, the formation mechanism of the complex fault zone, and the oil and gas reservoir formation conditions are analyzed, and the structural control effect on hydrocarbon accumulation is discussed by starting with the structural appearance and the causes of evolution in gucheng region. In conclusion, the oil and gas distribution in the work area of is summed up after the structure, reservoir and the control of oil and gas structures summed up. Finally, the newly discovered and implemented traps are comprehensively assessed, a favorable target is optimized,and the deployment of recommendations is made.The precise interpretation of the faults in gucheng - gaozhuang region is systemicly analyzed With the principle of overall anatomy, overall evaluation, and the overall re-understanding of the structural characteristics. In interpretation, the strike-slip tectonic model is introduced for the first time.It is suggested that the NW-trending faults are strike-slip faults which are formed in the Sedimentary late by the L-shape structure, cut off a series of north-east faults,and constitute the present tectonic pattern. The role of the gucheng-jinglou-Gaozhuang relief nose structure in the context of fault and unconformity dually controlling hydrocarbon accumulation is defined through the dissection of factors controlling hydrocarbon accumulation. In the paper, the unclear reasons of the relationship between oil and water in some areas in the old oil fields are reasonably explained through an overall analysis of re-understanding research results, and the well placement recommendations in different tectonic belts are proposed through the integrated study.