Petroleum system assessment of conventional-unconventional oil in the Jimusar sag, Junggar basin, Northwest China

Qiu Zhen , Zou Caineng , Dong Dazhong , Lu Bin , Shi Zhensheng , Tao Huifei , Zhou Jie , Lei Danfeng , Zhang Chenchen
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引用次数: 16

Abstract

In recent years, petroleum assessment incorporates the petroleum system concept method instead of the play concept method to estimate petroleum resources, because conventional-unconventional petroleum resources are more reliably estimated by the genetic similarities of petroleum fluids in the petroleum system. Conventional-unconventional oil resources co-exist in the Lucaogou-Permian petroleum system in the Jimusar sag of the Junggar basin, Northwest China. The mean in-place resources (IPR) of tight oil of the Lucaogou Formation (LF) were estimated at 2.0 billion tons by an integration method in the Jimusar sag. Based on the assessment of the technically recoverable coefficient by drill productivity, it is estimated that the mean technically recoverable resources (TTR) of tight oil are about 0.11 billion tons. The mean IPR and TTR of conventional oil of the Wutonggou Formation (WF) were evaluated at 0.36 billion tons and 0.06 billion tons by analogy methods, respectively. The ratio of mean IPR of unconventional oil to conventional oil in the Jimusar is about 5:1, but the ratio of mean TTR is only about 2:1. In addition, tight oil development is higher cost than conventional oil so far. Therefore, the development of tight oil in the Jimusar sag should be a careful consideration. Anyway, the integrated resource assessment of unconventional and conventional oil in the Jimusar sag could provide as a classic example for other lacustrine petroleum systems.

准噶尔盆地吉木萨尔凹陷常规-非常规油气系统评价
近年来,由于油气系统中含油气流体的遗传相似性能更可靠地估计常规-非常规油气资源,因此油气评价采用含油气系统概念法来代替储层概念法来估计油气资源。准噶尔盆地吉木萨尔凹陷芦草沟—二叠系油气系统中存在常规与非常规油气资源并存的现象。采用综合方法估算吉木萨尔凹陷芦草沟组致密油平均就地资源量为20亿吨。通过钻井产能对技术可采系数的评价,估计致密油平均技术可采资源量约为1.1亿吨。采用类比法计算得出梧桐沟组常规油平均IPR为3.6亿吨,TTR为0.06亿吨。吉木萨尔地区非常规油与常规油的平均IPR比约为5:1,而平均TTR比仅为2:1左右。此外,迄今为止致密油的开发成本高于常规油。因此,应慎重考虑吉木萨尔凹陷致密油的开发。总之,吉木萨尔凹陷非常规与常规油气资源综合评价可为其他湖相油气系统提供经典借鉴。
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