木34边底水油藏天然能量评价研究

The Evaluation of Natural Energy for Mu 34 Reservoir with Edge and Bottom Water

木34油藏为典型边底水油藏,由于对天然能量状况认识不足,随着开发进行,油藏递减快、压力下降快,开发形势变差,因此需要对油藏天然能量进行综合评价,为后期开发调整提供依据。为此,本文采用物质平衡法、非稳定流法等方法,首先对油藏边底水能量进行整体评价,然后对水侵量及水侵速度、水油体积比、地层压力等开发指标分别进行计算,并分析其变化情况。结果表明:木34油藏属于第2类天然能量较充足的油藏;水油体积比为18.78,水体较活跃。但随着开发进行,水侵系数、地层压力下降,需要补充地层能量。研究结果可指导后期开发调整工作,并为确定合理的转注时机提供依据。

Mu 34 reservoir is a typical reservoir with edge and bottom water. Due to the lack of knowledcge of natural energy,the production and formation pressure of the reservoir is declining,and the development efficiency reduces. So it is necessary evaluate the natural energy accurately. Authors analyse the natural energy of Mu 34 reservoir,and calculate the water influx,water influx coefficient,water body size and the change of pressure by use of material balance equation and other reservoir methods. The calculation results show that the energy of Mu 34 reservoir is sufficient. The water body size is 18.78. But with developing,water influx coefficient and pressure declines. So it need waterflooding to supply reservoir energy. The research results are valuable for developing adjustment lately.