Study On Simulation Methods And Application Of Petroleum Resource Abundance

In recent years, petroleum resource assessment is being developed from the evaluation of resources scale to quantitative prediction of their spatial distribution, and from resource evaluation to integration of resources and target evaluation. Petroleum exploration and development have expanded gradually from just traditional structural reservoirs to lithologic and stratigraphic reservoirs as important as structural reservoirs, from conventional to unconventional resources, and from the conventional closure traps to continuous reservoirs. Blocks with higher abundance are becoming less and less in all around the world, especially in China. Exploration domains are increasingly turning to low porosity, low permeability and lower abundance resources. Traditional methods of resource assessment have been difficult to meet the needs of rapid development of petroleum exploration. Developing more suitable, practical new methods has become the hot topic in the field of petroleum resource assessment.The purpose of this paper is to develop methods, technologies and practical process of simulation of petroleum resources abundance, and to develop software modules of the simulation. Through the methods and their application, we want to predict quantitatively the spatial distribution of petroleum resource, and to make pioneering research and upgrading for the further development of petroleum resource assessment.Prediction of petroleum resources spatial distribution contains two parts, one is the position that resource may exist, and the other is accumulation size in the position. Starting from these 2 points, we give statistical analysis of fractal characteristics of the scale of resource and resources abundance firstly. Secondly we discuss fractal characteristics of resources spatial distribution, and methods to study petroleum distribution through accumulation mechanism and spatial data analysis. Thirdly we propose the methods of simulation of petroleum resources abundance based on fractal characteristics of petroleum resources and Fourier Transform, which can convert information from space domain to frequency domain, or the other way round. The methods work through fractal model, Fourier Transform, spectrum simulation, and conditional simulation. We also study on the methods making comprehensive analysis on characteristics of petroleum scale and spatial location, and methods giving constraints and correction for the simulation of process by exploration risk, economic limit, etc. Lastly we demonstrate in details the process of the method and its effects through application on tight reservoirs of Putaohua in Gulong Sag, low abundance reservoirs of Fuyu in Zhaozhou - Chaoyanggou, northern part of Songliao Basin.The paper establishes methods for and application process for petroleum resources abundance, which has filled domestic gap in the field of petroleum resources spatial distribution. It also develops software modules for simulation of petroleum resources abundance that meet the needs of petroleum exploration practice. The application proves there have possibilities using such method to evaluate unconventional resources and look for "dessert" with relatively high abundance in low-abundance area. The evaluation in unconventional reservoir with low abundance and large-area shows well results.