三角洲内前缘地区岩性油藏探明储量井网密度

WELL SPACING DENSITY OF THE PROVED RESERVES FOR THE LITHOLOGIC OIL RESERVOIRS IN THE DELTA-FRONT REGIONS

大庆油田第九采油厂近年提交的探明储量主要位于三角洲内前缘沉积末端,以岩性油藏为主,在开发过程中储量落实程度低、开发动用难度大.以开发油田密井网砂体解剖结果为基础,结合探明储量规范,应用井网抽稀法,认为三角洲内前缘地区岩性油藏探明储量主要取决于井网密度.结果表明,要控制50.0％以上的砂体,井网密度应不小于6.25口/km2.研究成果为客观认识探明未动用储量奠定了基础.

The proved reserves offered in recent years for No. 9 Oil Production Plant of Daqing Oilfield are mainly from the end of delta-front regions. Most of them belong to the lithologic reservoirs. During the development, they are characterized by low degree of the verification and huge difficulty to develop and produce. On the basis of the dissected results of the sandbodies in the dense developing well patterns, integrating with the proved reserves speci- fications, the offered lithological reserves are mainly determined by the well spacing density. The achievements show that if more than 50% sandbodies are controlled, the corresponding density is not less than 6.25well/kin2. The study results stated above have laid a certain foundation for the objective understanding of the proven and unde- veloped reserves.