Gas And Water Distribution Regularity In Su20Block Of Sulige Gas Field

Abstract:Sulige gas field, which locate in Ordos Basin, is a typically tight sandstone gas reservoir. It already became to a gas field as biggest gas bearing area, the most reserves, and most production since2000, the year it has been discovered. Because of Sulige gas field, the Ordos Basin become to the biggest natural gas production base and hub. The exploration area of Sulige gas field is5×104km2. The central and west of the field, which area are about1×104km2, have developed for some years. In the area, the relationship of gas and water is complicated, and the wells produce water seriously. The phenomenon effects the gas field construction and production stably. Su20Block locates in the west of central Sulige, similar to the West Sulige on geological characteristics. Su20Block has reached the design capacity, and with the continued advance development, after the extension well of west production, water production seriously. The dynamic and static data of Su20Block are plentiful, to meet the needs of study on the relationship of gas and water. Study Su20Block as the object, has significance on the research relationship of gas and water in8th section of Shihezi Group and1st section of Shanxi Group, and on trillions of reserves producing in west area.In this thesis, guiding with hydrological geology, reservoir geology, logging geology, oil and gas reservoir system theory, comprehensive using data on geological, well logging, testing, formation water analysis and dynamic production analysis, persevering in combination of "Theory and practice","macro and micro","dynamic and static", analysis the chemical characteristics of formation water, reservoir microscopic reservoir pore structure, the microscopic mechanism of formation water, and main control factors, then the distribution regularity of formation water is clear. According to the characteristics of the reservoir pore structure, the capillary water can be divided into immovable I style water and movable II style water. In connection with tight gas reservoir water vertical profiles characteristic, on the foundation of Improve logging template, fine log interpretation by extract characteristic value, combine with the logging data to interpret reservoir fluid, improve the reservoir identification accuracy greatly. An investigation method of water producing gas wells by using IP (Index of Pressure) and IC (Index of Cumulative gas) as indexes was formed, to providing the basis for the field production management. The main control factors of gas and water distribution in Sulige gas field are (single) sand body, low amplitude structure and reservoir heterogeneity. Based on the main control factors, the formation water can be divided into lower part of stagnant water, lenticular stagnant water, and isolated lenticular water. Evaluate the level of activity of different types of formation water for the first time.Base on gas and water identification, and on regularities of distribution, characterization the distribution of formation water of each section as8th section of Shihezi Group and1st section of Shanxi Group. The field construction project was guided.