Salinized lacustrine organic-rich shale influenced by marine incursions: Algal-microbial community, paleoenvironment and shale oil potential in the Paleogene Biyang Depression, East China

Effective mud shale system of Hetaoyuan Formation in the Biyang Depression was divided base on geological and exploratory conditions. According to the relationship between TOC and oiliness, the classification evaluation criteria was identified to reflect the shale oil accumulation degree. Using ΔlogR method to identify organic carbon and oiliness, and the loss part of the oil was recovery corrected. According to the mechanism of generation-expulsion, the criteria of movable oil was identified. Using volume method, the total and movable oil resources were calculated. The results show that effective mud shale system is found mainly in the deep depression; shale oil resources is divided into three grades: enriched resources, low efficient resources, scattered resources; logging method can be used to identify organic carbon and oiliness; it is necessary to correct light and weight hydrocarbon. The total systematic resources is 894 million tons to 945 million tons, the total movable resources is 246 million tons to 237 million tons, the Upper Member of Eh3 resources have a higher degree of enrichment than the other two. Movable resources accounts for more than 25 percent of the total, and more than 90 percent of movable resources is attributed to Class I resources.

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FRACTAL CHARACTERISTICS OF CONTINENTAL SHALE PORES AND ITS SIGNIFICANCE TO THE OCCURRENCE OF SHALE OIL IN CHINA: A CASE STUDY OF BIYANG DEPRESSION

Fractals ◽

10.1142/s0218348x1840008x ◽

2018 ◽

Vol 26 (02) ◽

pp. 1840008 ◽

Cited By ~ 10

Author(s):

JIJUN LI ◽

ZHAO LIU ◽

JUNQIAN LI ◽

SHUANGFANG LU ◽

TONGQIAN ZHANG ◽

...

Keyword(s):

Fractal Dimension ◽

Specific Surface ◽

Pore Structure ◽

Surface Area ◽

Specific Surface Area ◽

Average Pore Size ◽

Shale Oil ◽

Small Pore ◽

Oil Adsorption ◽

Biyang Depression

Samples from seven major exploration wells in Biyang Depression of Henan Oilfield were compared using low-temperature nitrogen adsorption and shale oil adsorption experiments. Comprehensive analysis of pore development, oiliness and shale oil flowability was conducted by combining fractal dimension. The results show that the fractal dimension of shale in Biyang Depression of Henan Oilfield was negatively correlated with the average pore size and positively correlated with the specific surface area. Compared with the large pore, the small pore has great fractal dimension, indicating the pore structure is more complicated. Using S1 and chloroform bitumen A to evaluate the relationship between shale oiliness and pore structure, it was found that the more heterogeneous the shale pore structure, the higher the complexity and the poorer the oiliness. Clay minerals are the main carriers involved in crude oil adsorption, affecting the mobility of shale oil. When the pore complexity of shale was high, the content of micro- and mesopores was high, and the high specific surface area could enhance the adsorption and reduce the mobility of shale oil.

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