Oil Resource Potential Evaluation Of Fuyu Oil Layer In Daqing Chaoyanggou Oil Field Surrounding Region

The Chaoyanggou oilfield is located at the bordering regions of three(cities)towns of Heilongjiang Province,which are Zhaozhou,Zhaoyuan and Zhaodong.It includes twenty-three developed block,which is in the middle and later periods of its development.At present,major problems of this oilfield are that: all of the high-grade large-scale oil deposits have been discovered and oil-water distribution is completed from the axial regions of Chaoyanggou to its surrounding regions;in terms of deposition,sand shale thin inter-layers are mostly found in oil sections,with small-scale sand stones and poor physical properties;surrounding regions have low degree of well control.The complicated geological conditions make the identification of such regions very difficult,resulting in seriously insufficient backup reserves.It is imperative to gradually expand exploitation of reserves and look for new potential resource zones through fine structure and reservoir recognition.This paper recognizes the structures and faults of the four three-dimensional blocks,based on three-dimensional seismic data and through the combination of well logging with seismic data,and it confirms one hundred and ten quaternary structure with an area of two hundred and fifty-nine point five square kilometre.Technical measures such as seismic attributes and seismic inversion are applied to forecast five hundred square kilometre reservoirs,and depict sixty-two main sand body bigger than three metres,with an area of five hundred and thirty-nine square kilometre.In addition,based on regional reservoir-forming regularity and fine reservoir description of developed blocks,and by taking careful review of old wells for candidate wells as the breakthrough point,and search of favorable regions for reservoir forming as the breakthrough direction,this paper points out two factors of controlling hydrocarbon accumulation including that structural high parts of fracture development zone are favorable area for hydrocarbon accumulation and thick sandstone provides a reservoir for oil-gas accumulation,which has two modes of upper-generating and lower-reservoiring vertical and side migration and accumulation,and conducts evaluation and classification of reserves according to structure,reservoir research results and “four characters of reservoir” relations.It proposes twenty-nine wells for formation retesting and confirms reserves of three thousand one hundred and ninety-two million tons.It also proposes objective zones good for exploration,and suggests thirteen locations of well.Relevant techniques and research results developed in this project have important significance in guiding further exploration and development deployment in this region.