吐哈丘陵油田水淹层轻烃解释评价方法

Light hydrocarbon interpretation and evaluation methods for water flooded intervals of Qiuling Oilfield of Tuha

丘陵油田为吐哈油区主力油田,目前已进入高含水开发期,为了进一步判断油层的水淹程度,实现有效开发,从录井轻烃分析技术角度阐述了油层水淹程度解释评价的参数选择、途径与方法,以轻烃分析和水淹层的表现特征为依据,归纳总结了4种方法——轻烃色谱图解法、轻烃图板解释法、单井多参数纵向连续解释法和单井三参数棒状图解法。应用这4种方法进行解释评价的原则是,首先利用轻烃色谱图解法初步定性判断储集层水淹程度,而后应用单井多参数纵向连续解释法和三参数棒状图解法从微观和宏观两个方面揭示储集层内部及之间的水淹程度差异,进而实现油层水淹程度的有效识别。两年来丘陵油田利用该系列轻烃分析解释评价方法,相继对该油田老油区10口开发井进行了连续采样分析和水淹层解释评价。经16个层试油验证,解释符合率达75%,证实这一方法有效、可行,从而为吐哈油区水淹层解释评价提供了新的途径。

Qiuling Oilfield is the dominant oilfield of Tuha area,it has entered into late high water cut stage,in order to further identify reservoir watered-out degree and realize effective development,setting from the point of mud logging light hydrocarbon analysis technique,the authors expounded the parameter selection and channels and methods for interpreting and evaluating reservoir watered-out degree,and according to the characteristics of light hydrocarbon analysis and watered-out layers,the authors summed up 4 methods,which were light hydrocarbon chromatographic graphical method,light hydrocarbon chart interpretation method,single well multi-parameter vertical-continuous interpretation method and single well three-parameter stick plot method. The principle of applying these four methods to interpret and evaluate is that first light hydrocarbon chromatographic graphical method was used to initially qualitatively judge the reservoir watered-out degree,then single well multi-parameter vertical-continuous interpretation method and three-parameter stick plot method are used to reveal watered-out degree discrepancy within or between reservoirs from micro-aspect and macro-aspect,thus realizing the reservoir watered-out degree effectively identification. Since this series of light hydrocarbon analysis interpretation and evaluation methods has been used in Qiuling Oilfield for two years,they have been continuously used for sampling analysis and interpreting and evaluating water flooded intervals for more than ten development wells one after another from old oil areas of this oilfield. The oil testing for 16 intervals verified that interpretation coincidence rate is up to 75 percent,it proves that this method is effective and feasible and provides a new channel for water flooded interval interpretation and evaluation in Tuha oil area.