Integrated Geophysical Exploration Methods In The Study Of Buried Hill Reservoir

A number of the buried hill oil-gas fields in Jizhong depression of Bohaiwan basin have been discovered successively through twenty years exploration since high producing oilfield in Renqiu has been discovered in 1970' s. These buried hill reservoirs with large reserves and high yields take mostly proved oil-gas reserves of Jizhong depression. So, it is very important that we reveal the type of the buried hill reservoir further and research the geophysical method of the buried hill exploration to deepen the buried hill exploration-and continuity found subtle and new buried hill reservoirs.Combined with the actual future of work area, the total idea that we recognize and evaluate the buried hill reservoir by integrated geophysical exploration method is that obtain a geologic interpretation result with new ideas by using of gravity and seismic joint inversion interpretation techniques from point to line and from line to pane and from know to unknown. On the basis of it, fully utilizing reservoir prediction new means such as coherent data cube analysis and seismic attribute analysis etc. as to geophysical characteristic of fissure and carven development of carbonate reservoir and seismic reversion variation after hydrocarbon-bearing, combined with stress analysis, gradually summarized a set of auxiliary method of predicting the fissure and carven of carbonate reservoir to service exploration and development of the field.Research tract is located in Suqiao-Yangcun slope and Hexiwu structure belt of Langgu sag of Jizhong depression. Research series of strata are the formations of Ordovician and Cambrian in Paleozoic. Research contents include: (1)Comprehensive research has been performed through integrated gravity and magnetic, electricity and seismic data, combined with regional geologic structure to build the geologic interpretation model of the research area. (2)On the basis of the geological structure frame of building research area, seismic interpretation scheme is continuity corrected by comprehensive analysis and joint inversion interpretation of diversified geophysical data in order to achieve the most matching of various data. (3)Application of reservoir prediction method involved coherent cube analysis and seismic attribute analysis predict the distribution of fracture development belt in the buried hill and a favorable hydrocarbon-bearing area, providing basis for further exploration and development. (4) Summarizing the application effects of various methods so as to lay the foundation for research and exploration of the buried hill reservoir conducted by diversified integrated auxiliary technology. InversionThe main method and key technology is that: (1)Gravity and seismic joint reversion interpretation. (2)Predicting reservoir from Continuous Electromagnetic Profiling Method. (3)3-D seismic visualization and interpretation. (4)Coherent data cube analysis. (5)Characteristic parameters reversion. (6)The arithmetic of NN probability and seismic attribute analysis.The research achievement and knowledge is that: (1) Interpretation precision is improved largely through joint interpretation of many kinds of data and confirmation and supplement of various data from each other.. This method provide a set of feasible means and actual method for researching buried hill in the future. It should be regarded as an effective method to find the Subtle Buried Hill by integrated interpretation and inversion analysis of many kinds of data for deep buried hill exploration, in particular complicated area with poor seismic quality. (2) As to carbonate reservoir, it is,important to predict the lithology and distribution of fracture development. Now the most effective means on predicting fracture is the characteristic parameters reversion, coherent cube and attribute analysis of seismic amplitude and frequency. (3)Seismic visualization provide convenient for three-dimensional interpretation, it should be extended vigorously. (4) It is suggested that one well is drilled in Yangshuiwu buried hill under various predominant...