Integrated Interpretation Of Seismic Data And Recearch On Structural Characteristics For Wangkui-lanxi Area

With the guidance of structural geology,sequence stratigraphy and sedimentology, on the basis of the former study and new seismic data with logging, borehole log and core, the structural interpretation of seismic data for Wangkui-Lanci area had been studied. We can identify the regional unconformity interface and trace it exactly. And the isochronal stratigraphic frame had been established.With the geological stratification, to value of wells and actual structure background, and using the sectional fitting method we establish velocity field of the study area.And then the average velocity of the study interval had been extracted. Continuous changeable velocity maps had been made.With the study of structure feature of this area, the structure distribution is different between the deep horizon and the shallow one. The structure of deep horizon had divided into three NE depression regions, one bump region, one anticline and one ramp region. That of shallow and middle horizon had been divided into three NE anticline regions, two depression regions and one ramp region. The basin can be divided into four structure layers:structural layer of fault depression, structural layer of fault depression conversion, depression structure layer and reversal structural layer. Three structure systems can be identified:top structure system, bottom structure system and inherited structure. And two main structural patterns and six secondary structural patterns can be found:extend tructural pattern(including listric fault, rolling anticline, structure broken region and breaking of contact region) and reversal structure pattern(including reversion and composite reversion).On the basis of the structure feature and the analysis of structure development, the law of structure had been made. Make sure that the study area had subjected to the period of intensive fault depression, the period of fault depression conversion, the period of depression and reversal period. With the distribution feature of horizon and deposit, the basin can be divided into shallow, middle and deep combination of reservoir and cap formation.Through the application of the theory and technology, the oil and gas in this area mainly gathered in the local structure zone. Structure in the area played a role in blocking the channel and a delivering role. Development of structure and fracture is important control cause of hydrocarbon accumulation. With comprehensive analysis of structure, deposition, gas detection, drilling information and data, the study area was divided into three good oil and gas area.