Oil Field Seismic Geology Synthetic Study Method

Putaohua oilfield is a large one in the area of seventh oil production plant of Daqing oilfield. Its development history more than 20 years and yearly output more than 1 million tons. In late of development, scientific and technical personnel search the technology which can assure stable yields of maturing field. This paper is guided by oil field geology, focused on application study of production seismology, started from closely associate oilfield reality with productive requirement, detailedly use geophysical information of subsurface, carry on study of method application. For more than two years, a system study and application process from seismic data processing to fine reservoir description has been finished, and perfect achievement has been reached. It finds a practical way for stable yields of maturing field, makes scientific study to real productivity.In the real study, this paper carried joining processing of 3D seismic data in Putaohua oilfield firstly, proposed a suit solution of 3D seismic data joining under different survey condition. Complete joining of 1014 km2 Putaohua oilfield 3D seismic data has been finished under the guide of oilfield informationization processing with prestack amplitude-preserving migration.Brand new ideal and technology were used in seismic data processing, which obtained structure elucidation and lithologic interpretation at the same time. Full tree dimensional interpretation is used to interpret and close tectonic level. Maximal mining remanent low amplitude and mini fault oilfield. Using multiple seismic attributes, carried lithologic interpretation, search concealed lithologic oilfield. Objectively use the most advanced method and front technology, such as reasonably interpret fault complex in plane with coherent body, stratigraphic dip and edge prospecting, compile structural map with variable velocity field. In reservoir prediction, use lateral slice, spectrum energy imaging, absorption coefficient calculation, wave impedance inversion and geophysical character inversion, prestack fracture identification and prestack AVO inversion, and propose process from qualitative prediction to quantitative description which is practical in oilfield. Reservoir sedimentary microfacies interpretation and reservoir finely geologic model construction are used to characterize reservoir geologic character, which supply foundation for later develop plan adjusting.Reservoir type and depositional model are constructed though the study of regional structural developed history and formation characteristics, relationship between reservoir development and structure as well as depositional evolution, relationship between hydrocarbon accumulation and structural evolution. Finally through cognition to the reservoir, sum up the study result about the structure and the reservoir, draw up the evaluation criterion about the oil and gas favorable zone, ascertain the indexes such as area and amplitude of the favorable zone, deploy the suggestive well location, and in the last, complete the comprehensive study content of target area, thereby establish a set of more comprehensive and more consummate study work flow line for petroleum seismic and geological comprehensive study. According to the actual well drilling in the late study, it is confirmed to obtain a perfect economic value and society profit.