Organic geochemical identification of reservoir oil–gas–water layers in the Junggar Basin, NW China
Organic geochemical identification of reservoir oil–gas–water layers in the Junggar Basin, NW China
复制标题
DOI：
10.1016/j.marpetgeo.2014.07.006
复制
发表时间：
2014-11
影响因子：
4.2
通讯作者：
Ming Wu;Jian Cao;Xulong Wang;Yong Tang;Baoli Xiang;Bin Wang
中科院分区：
文献类型：
--
作者：
Ming Wu;Jian Cao;Xulong Wang;Yong Tang;Baoli Xiang;Bin Wang
储层油气水层识别是石油勘探开发的一项基础性工作，但也是一项难点问题，特别是在油气运聚复杂的情况下。在这种情况下，油气运移和反运移非常普遍，导致残留或古油藏和油层的存在，这些油层不容易被常规测井和地球物理数据识别或误解为油层。本文以准噶尔盆地中部鲁西地区为例，从有机地球化学的角度对其进行了表征。提出了具体的有机地球化学指标参数，如储层萃取物氯仿沥青含量，油层中氯仿沥青含量通常为100 ~ 1.0%。首次探索了含油包裹体颗粒（GOI）（含油包裹体矿物颗粒与矿物颗粒总数之比）在准噶尔盆地油气水层识别中的应用；这种方法在其他地方也使用过。油层、油水层、水层和干层的最大GOI值分别为0.11%、7% ~ 11%、6% ~ 7%和<6%。此外，利用生物标志物对常规有机地球化学参数难以识别的气层和稠油层进行了识别。气层中可溶储层沥青的典型特征包括三环萜烷的丰度（一般为五环萜烷的两倍）显著高于三环萜烷，三环萜烷分布在C20> C21> C23。相反，稠油层的典型特征是储层沥青提取物中存在25-去藿烷。这些具体指标可以应用于准噶尔盆地和其他类似的环境。
The identification of reservoir oil–gas–water layers is a fundamental task in petroleum exploration and exploitation, but is difficult, especially in cases of complex hydrocarbon migration and accumulation. In such cases, hydrocarbon remigration and dysmigration take place very commonly, leading to the presence of residual or paleo-oil accumulations and layers, which cannot be easily identified or misinterpreted as oil layers by conventional logging and geophysical data. In this paper, based on a case study in the Luxi area of the central Junggar Basin, NW China, we seek to characterize such layers in terms of organic geochemistry. We suggest specific indicator parameters of organic geochemistry such as the chloroform bitumen content of reservoir extracts, which is usually >1.0% in oil layers. We explore the application of grains containing oil inclusions (GOI) (the ratio of mineral grains containing oil inclusions to the total number of mineral grains) for the identification of oil–gas–water layers in the Junggar Basin for the first time; this method has been used elsewhere. The maximum GOI values for the oil layers, oil–water layers, water layers and dry layers are >11%, 7%–11%, 6%–7% and <6%, respectively. In addition, gas layers and heavy-oil layers that are difficult to identify by conventional organic geochemical parameters were identified using biomarkers. The typical characteristics of the soluble reservoir bitumen in the gas layers include a much greater abundance of tricyclic terpanes (two times in general) relative to pentacyclic terpanes and a tricyclic terpane distribution of C20> C21> C23. In contrast, the typical characteristic of the heavy-oil layers is the presence of 25-norhopanes in reservoir bitumen extracts. These specific indicators can be applied in the Junggar Basin and in similar settings elsewhere.