Journal Article

Lacustrine Shale Oil Resource Potential of EsL 3Sub-Member of Bonan Sag, Bohai Bay Basin, Eastern China

Zhentao Wang, Shuangfang Lu, Huiting Hu, Linye Zhang, Min Wang, Dianshi Xiao, Zhandong Li, Wei Liu, Guohui Chen

2017

Overview

Following shale gas, shale oil has become another highlight in unconventional hydrocar-bon exploration and development. A large amount of shale oil has been produced from a host of marine shale in North America in recent years. In China, lacustrine shale, as the main source rock of conven-tional oil and gas, should also have abundant oil retained in place. In this study, geochemical and geo-logic characteristics of lacustrine shale from EsL 3sub-member in Bonan sag were characterized by using total organic carbon (TOC), Rock-Eval pyrolysis, X-ray diffraction, and?logR method. The results show that the EsL 3sub-member shale have TOC contents ranging from 0.5 wt.% to 9.3 wt.%, with an average of 2.9 wt.%. The organic matter is predominantly Type I kerogen, with minor amounts of Type Ⅱ1 kerogen. The temperature of maximum yield of pyrolysate (Tmax) values ranges from 424 to 447 °C, with an average of 440 °C, and vitrinite reflectance (Ro%) ranges from 0.7% to 0.9%, indicating most of shales are thermally mature. The dominant minerals of EsL 3shale in Bonan sag are carbonates (in-cluding calcite and dolomite), averaging 51.82 wt.%, and the second minerals are clay (mostly are montmorillonite-illite-mixed layer and illite) and quartz, averaging about 18 wt.%. Finally, its shale oil resources were evaluated by using the volumetric method, and the evaluation result shows that the shale oil resource is up to 5.94 billion tons, and mostly Class Ⅰ resource. Therefore, the exploration of the lacustrine shale oil of EsL 3in Bonan sag should be strengthened.

• Publisher: Research Institute of Unconventional Petroleum and Renewable Energy(RIUP& RE), China University of Petroleum,Qingdao257015, China%Geology Scientific Research Institute of Shengli Oilfield Co. Ltd., Dongying257015, China%Shandong Geological Environmental Monitoring Station, Jinan 250014, China%College of Petroleum Engineering, Northeast Petroleum University, Daqing163318, China