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Discussion of Grading Evaluation Criteria to Study Shale Oil Resources in Zhanhua Sag
Author(s) -
CHEN Weitao,
JIANG Zhenxue,
SU Siyuan,
CHEN Lei,
JI Wenming
Publication year - 2015
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12302_6
Subject(s) - beijing , petroleum , china , prospecting , mining engineering , petroleum engineering , geology , geography , archaeology , paleontology
more and more attention. The method to correctly evaluate the shale oil potential is the key for resources evaluation. Some foreign scholars argued that the amount of hydrocarbon-bearing per unit organic carbon (S1/TOC) was effective to determine the producible shale oil, known as “Oil crossover ”, while the method has some limitation when used to evaluate the enrichment of shale oil. However, some Chinese scholars divided the shale oil resources into three classifications in Songliao Bsin, Hailar Basin, Jiyang depression, Biyang depression and other areas, on the basis of the relationship between the oil content of the shale (S1 and chloroform asphalt “A”) and the total organic carbon (TOC), this method could better evaluate the enrichment degree of shale oil but not consider the recoverability. In this paper, based on the previous researches in Zhanhua sag, the enrichment and the recoverability are combined to establish grading evaluation criteria of shale oil, the former indicated by absolute oil content (S1), and the latter by relative oil content (S1/TOC), the two indicators from 83 samples of L69 well were mainly used to evaluate the quantity and quality of the shale oil resources. We thought that shale oil resources in Zhanhua sag can be divided into five classifications:(1) enriched and more efficient resources (2mg/g1), such shale has the most abundant oil that has meet various requirements of oil residual in shale, oil is saturated in shale and the surplus oil is expelled, thus this type of resources can be the most desirable target for exploitation; (2) enriched and less efficient resources (2mg/g1), such shale has relatively moderate oil content, oil is not saturated in shale and has low resources potential; (4) less efficient resources (1mg/ g