CAJ | 학술논문

针对中国现行石油储量标准新增探明储量估算采收率方法不适用于特低渗透水驱砂岩油藏的问题，研究了标定其采收率的新经验公式和类比法。经统计分析，影响采收率的关键参数为渗透率、地层原油黏度、孔隙度、流度和井网密度。根据开发时间较长、储量可靠和油藏参数齐全等条件筛选出37个特低渗样本油藏，提出19个采收率经验公式模型，考虑相关系数高和标准误差低等原则，选出适用于直井注水开发的4个采收率经验公式，经与近年可采储量标定结果检验，符合率高。类比法应选择成功开发试验区和随后大规模开发油藏作为类比的标杆油藏。依据采收率选值与生产动态一致的原则，采用类比法确定了FX油田三叠系长8特低渗透油藏标定采收率。经验公式法和类比法各有优缺点，储量评估时尤其应注意资料可靠性，经验公式法应注意适用条件，类比法中避免油藏单一性。图3表7参20
침대중국현행석유저량표준신증탐명저량고산채수솔방법불괄용우특저삼투수구사암유장적문제，연구료표정기채수솔적신경험공식화류비법。경통계분석，영향채수솔적관건삼수위삼투솔、지층원유점도、공극도、류도화정망밀도。근거개발시간교장、저량가고화유장삼수제전등조건사선출37개특저삼양본유장，제출19개채수솔경험공식모형，고필상관계수고화표준오차저등원칙，선출괄용우직정주수개발적4개채수솔경험공식，경여근년가채저량표정결과검험，부합솔고。류비법응선택성공개발시험구화수후대규모개발유장작위류비적표간유장。의거채수솔선치여생산동태일치적원칙，채용류비법학정료FX유전삼첩계장8특저삼투유장표정채수솔。경험공식법화류비법각유우결점，저량평고시우기응주의자료가고성，경험공식법응주의괄용조건，류비법중피면유장단일성。도3표7삼20
The methods of estimating recovery factor of newly added measured reserves in existing petroleum reserves standardization of China are unsuitable for sandstone oil reservoirs of extra-low permeability with water flooding, so new empirical formula method and analogous method for estimating recovery factor of the reservoirs are studied. The key parameters influencing recovery factor are permeability, formation oil viscosity, porosity, mobility and well spacing density. Based on the requirements such as longer development time, reliable reserves and available reservoir parameters, 37 sandstone oil reservoirs of extra-low permeability were selected, and 19 recovery factor models were summarized. With consideration of high multiple regression coefficient and low standard error, 4 empirical formulae suitable for reservoir of water-flood development with vertical well were established. Comparison of calculated results from the empirical formulae and calibrated recovery factors of PetroChina recently shows that the formulae match well. It is important to choose reservoir with successful pilots and/or developed in large scale as benchmark reservoirs in the analogy estimation. Based on the principle of keeping consistent of analogous method with production performance, a practical example of Chang 8 reservoir, Triassic, FX oilfield was given to illustrate the determination of recovery factor of extra-low permeability reservoir. Empirical formula method and analogous method have their advantages and disadvantages, reserves estimators should pay great attention to the reliability of data, to application condition for empirical formulae method and to the avoidance of single reservoirs in analogous method.