首页| Petroleum resource potential evaluation using insights based on hydrocarbon generation, expulsion, and retention capabilities-A case study targeting the Paleogene Es1 formation, Qikou Sag
Petroleum resource potential evaluation using insights based on hydrocarbon generation, expulsion, and retention capabilities-A case study targeting the Paleogene Es1 formation, Qikou Sag
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NSTL
The Shahejie Formation of the Bohai Bay Basin has been set as a favorable shale oil area for exploration in currently practice. However, the process was impeded by the obscurity of favorable exploration area in the shale play and resource evaluation targeted at the main research area, the Qikou Sag. In particular, there is a need for a systematic assessment of the various types of resources present. The study presented herein emphasizes on quantifying source rock generation, expulsion, and retention hydrocarbon characteristics using the advanced hydrocarbon-generation potential model (HGPM) in the first member of the Paleogene Shahejie Formation (Es1) of the Qikou Sag. Geological and geochemical features reveal that the Es1 source rocks are of relatively high quality with a 1200-m maximum thickness and abundant organic matter (total organic carbon (TOC) content of 2.27% on average; type I kerogen dominated; mature stage). The type of organic matter was reassessed using the progressive and reasonable dimensionless TOC and S2 variables. The HGPM demonstrated that the expulsion threshold was R_o = 0.50% and the maximum generation hydrocarbon potential (Q_g), expulsion hydrocarbon potential (Q_e), and retention potential (Q_r) were 746.99, 231.57, and 515.42 mg HC/g TOC, respectively. The hydrocarbon generation (I_g), expulsion (I_e), retention (I_r), and effective retention intensity (I_(re)) all centered in the Qikou main depression at 450 x 10~4, 200 x 10~4, 300 x 10~4, and 230 x 10~4 t/km~2, respectively. The predicted resource potential can be finally queued as follows; retention shale resources with 22.90 x 10~8 t oil equivalent, including movable shale oil and gas of 12.21 x 10~8 t, and conventional and tight oil or gas resources with 9.62 x 10~8 t oil equivalent. The most favorable exploration areas are mainly distributed in the Qikou main depression and Qibei Subsag. Quantitative and detailed evaluation provides a reasonable prediction of exploration targets and prospects and further mitigates risks and losses incurred during shale-exploration successions.
NSTL
