Structural Characteristics Research Of Yongan-Bailian Area,Hainan Fushan Sag

Fushan Sag, a dustpan shape one that belonging to the southern slope in Beibu Gulf Basin,the overall present a South- North fault tectonic pattern. Drilling of Fushan Sag reveal that there are four sets of oil-bearing series including Weizhou formation, member 1-3 of Liushagang formation,and it is found three oil and gas fields,Huachang,Meitai,Bailian,and three oil gas structures, Jinfeng, Chaoyang, Yongan. Among these, Huachang,Bailian,Jinfeng and Yongan are located in the study area,they are the most potential exploration zones of Fushan Sag.In recent years, with the deepening of basic study in Fushan Sag, the success rate of drilling is improving, the annual output has a steady growth.A good result on the exploration and development has been exhibited, and more and more wells in Weizhou formation and Liushagang formation have oil and gas shows or get industrial and high oil and gas flow, all above shows it has a good exploration prospect in Fushan Sag.However, a lot of problems have been found in the process of exploration and development, such as the structure is complex, less numbers of trap are available for drilling, the reservoir changes quickly in the horizontal, the screened of igneous rock result in a poor quality of seismic data, and accordingly the above all lead toincrease the difficulty of exploration and development.According to the difficulties, this paper carries out the comprehensive seismic geology research of Yongan-Bailian area, based on the re processing of seismic data with the reverse time migration test research in CNPC.With the foundation of sequence stratigraphy research, the paper has carried out series research works,such as fine structure interpretation, reservoir prediction, hydrocarbon detection and zone selection, formulated the corresponding measures for each study content, and combined with a number of key technologies during the course of the research.Through the research, the project has gotten series results, like reimplementation of the structure and the distribution of the faults, the characteristics of reservoir development, a clear knowledge about the main controlling factors of reservoir in these areas, and based on the results, the paper has carried out comprehensive evaluation, selected the advantageous zones, and pointed out the direction of further research.