Reserval气体比率法在渤海探区BZ油田的应用

在海上录井随钻解释工作开始时间并不长、解释符合率还不是很高的情况下,如何捕捉钻井中的油气显示层,开展定量评价油气层,特别是不漏掉薄层、轻质油气层及低电阻率油气层,具有极其重要的意义。Reserval气体比率法利用轻烃与中烃比率(RLM)、轻烃与重烃比率(RLH)以及重烃与中烃比率(RHM)曲线的组合形态,可以指示不同的储集层流体性质,甚至可根据它们的变化很容易地辨认出油水界面,较好地解决了渤海海上常用方法无法解释的问题。利用以Reserval气体比率法为主,结合其他录井等相关资料,对渤海探区BZ油田已钻的19口井进行解释评价,结果显示:气层解释符合率100%,油层解释符合率87.3%,油水同层符合率62.5%,水层符合率73.7%,总体符合率达到83.9%。Reserval气体比率法的应用,提高了渤海轻质油、凝析油、低电阻率油层的解释精度。

The Application of Reserval Gas Ratio method in BZ Oilfield of Bohai Bay Basin

Coincidence rate of interpretation is still not high at the beginning of offshore logging interpretation while drilling.How to catch hydrocarbon show formations and evaluate hydrocarbon reservoirs quantitatively is very important,and especially thin layers,gas reservoirs with light weight oil and hydrocarbon reservoirs with low resistivity should not be missed.Reserval gas ratio method is：curve association form of ratio of light hy drocarbon to medium hydrocarbon （RLM）,ratio of light hydrocarbon to heavy hydrocarbon （RLH）and ratio of heavy hydrocarbon to medium hydrocarbon （RLM） may indicate fluid property of various reservoirs and identify oil/water boundary easily,which solves the unsolvable offshore problem by normal method for the Bohai Bay.Drilled 19 wells in BZ oilfield of Bohai Bay Basin are interpreted and evaluated through the Reserval gas ratio method and other related data of well logging.The result shows that coincidence rate of interpretation for the gas reservoir,oil reservoir,oil and water produced from the same interval and water layer is 100%,87.3%,62.5% and 73.7% respectively,and total coincidence rate is 83.9%.Application of the Reserval gas ratio method may improve interpretation accuracy of the oil reservoirs with light weight oil ,gas condensate and low resistiv- ity in Bohai Bay.