Jiyang Depression Buried Hill Oil And Gas Exploration Target Area Selection And The Corresponding The Geophysical Countermeasures

Shengli oilfield has stepped into an exploration stage of complicated reservoir, and buried hill is one of the most important exploration targets. Due to complication in reservoir forming condition, it is very difficult to explore and exploit petroleum from buried hill reservoir. Based on classification of reservoir type and analysis of reservoir forming condition, the paper pointed out target area for buried hill exploration in Jiyang depression. According to morphology, buried depth and complication of the buried hill, different geometry for seismic data acquisition were demonstrated and designed. Corresponding geophysical prospecting method was brought forward, and an integrated designing and procedure for seismic data acquisition in buried hill area was established.Based on genesis and morphology of buried hill trap, relationship between trap and source rock and migration features, the paper classified buried hill reservoir into the following types: Faulted block type, fold type and residual hill type. Reservoir forming conditions for each type were analyzed. To solve problems that restricted data quality, the paper put forward an integrated idea for seismic data acquisition precept in buried hill area. According to geological features of buried hill in Shengli oilfield, 6 theoretical geologic models were established such as arch fold type, faulted block type and weathering residual hill type, etc. With the help of advanced designing software and through forward modeling, the paper put forward different geometry for different kind of buried hill type. This technique was applied in Linfanjia buried hill area. After detailed demonstration, several geometry were designed for application, and analysis showed that swath method geometry with 12 receiver lines and 18 shot points was the most suitable. Operation result showed that this kind of geometry is advantageous compared with the geometry used to the east of this area. Study indicated that seismic exploration in buried hill area should make good use of advanced software for 3-dimentional acquisition designing, emphasize parameter demonstration based on analysis of geologic model, aimed at geological task, optimize all kinds of acquisition parameters and then decide the best seismic exploration method.