scholarly journals Enrichment Factors and Resource Potential Evaluation of Qingshankou Formation Lacustrine Shale Oil in the Southern Songliao Basin, NE China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Long Luo ◽  
Dongping Tan ◽  
Xiaojun Zha ◽  
Xianfeng Tan ◽  
Jing Bai ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Well Logging ◽  
Enrichment Factors ◽  
Songliao Basin ◽  
Hydrocarbon Generation ◽  
Shale Oil ◽  
Resource Potential ◽  
Potential Evaluation ◽  
Lacustrine Shale ◽  
Exploration And Development

China shale oil, which is preserved in lacustrine shale with strong heterogeneity and relatively low maturity, has been a research hotspot of unconventional resources. However, controlling factors of shale oil enrichment and resource potential evaluation restricted efficient exploration and development of lacustrine shale oil. On the basis of well logging data, TOC content, Rock-Eval pyrolysis values, thermal maturity, 100 oil saturation data, and pressure coefficient, the core observation, X-ray diffraction analysis, physical property analysis, scanning electron microscopy, CT scan, well logging interpretation, and volumetric genesis method depending on three-dimensional geological modeling were used to determine enrichment factors and evaluate the resource potential of Qingshankou Formation shale oil in the Southern Songliao Basin. Shale oil was mainly enriched in the semideep and deep lake shale of K2qn1, with the high capacity of hydrocarbon generation and favorable petrological and mineralogical characteristics, pore space characteristics, and physical properties in the low structural part of the Southern Songliao Basin. The three-dimensional geological resource model of Qingshankou Formation lacustrine shale oil was determined by the key parameters (Ro, TOC, and S 1 ) of shale oil in the favorable zone of the Southern Songliao Basin, northeast China. The geological resource of shale oil, which was calculated by two grid computing methods ( F 1 and F 2 ), was, respectively, 1.713 × 10 12   kg and 1.654 × 10 12   kg . The great shale oil resource indicates a promising future in the exploration and development of Qingshankou Formation shale oil of the Southern Songliao Basin.

Pore structure of the Cretaceous lacustrine shales and shale-oil potential assessment in the Songliao Basin, Northeast China

2021 ◽  
Vol 9 (1) ◽  
pp. T21-T33
Author(s):  
Weizhu Zeng ◽  
Guoyi Zhou ◽  
Taotao Cao ◽  
Zhiguang Song
Keyword(s):  
Pore Structure ◽  
Saturation Index ◽  
Great Influence ◽  
Micropore Volume ◽  
Songliao Basin ◽  
Hydrocarbon Generation ◽  
Shale Oil ◽  
Oil Saturation ◽  
Positive Correlation ◽  
Layer Mineral

Aiming to study the pore structure and its impact on shale oil enrichment, a total of nine lacustrine shales (including one immature shale and eight mature shales) from the Qingshankou Formation in the Songliao Basin were subjected to low-pressure gas sorption (LPGS) of CO2 and N2 and mercury intrusion capillary pressure (MICP) measurements. The combination of the LPGS and MICP methods demonstrates that the pore volumes of these shales are mainly associated with mesopores, whereas the micropores and macropores are relatively undeveloped. The correlation between the shale compositions and pore volumes of LPGS suggests that the micropores and mesopores are mainly contributed by illite/smectite mixed layer mineral. On the contrary, we have found that the oil/bitumen and carbonates could occupy the micropores and mesopores, respectively, and reduce these pore volumes significantly. The oil saturation index (OSI) was found to display a positive correlation with the maturity Ro value in the range of 0.37%–1.24%, and this may suggest that the shale-oil content is controlled by hydrocarbon generation. However, the pore structure also exerts a great influence on the shale oil enrichment. We suggested that the porosity of MICP could be considered as an index for appraising the shale-oil potential of a given shale player because there is a good positive correlation between the porosity of MICP and the OSI value. Furthermore, a negative correlation between the micropore volume and the OSI value may imply that the shale oil could be adsorbed in micropores, whereas a good positive correlation between the OSI value and the Hg-retained ratio suggests that shale oil is a kind of residual hydrocarbon, which is closely related with the mesopore volume of these shales.

Pore characteristics of lacustrine mudstones from the Cretaceous Qingshankou Formation, Songliao Basin

2017 ◽  
Vol 5 (3) ◽  
pp. T373-T386 ◽  
Author(s):  
Min Wang ◽  
Shuangfang Lu ◽  
Wenbiao Huang ◽  
Wei Liu
Keyword(s):  
Organic Matter ◽  
Source Rock ◽  
Gas Adsorption ◽  
Total Pore Volume ◽  
Songliao Basin ◽  
Hydrocarbon Generation ◽  
Shale Oil ◽  
Pore Characteristics ◽  
Oil Accumulation ◽  
Average Pore

Cretaceous Qingshankou ([Formula: see text]) mudstone of lacustrine origin is the major source rock for conventional hydrocarbon currently being produced in the Daqing and Jilin oilfields of the Songliao Basin, which is one of the largest continental basins in the world. Therefore, elucidating the geochemical and petrological characteristics of the [Formula: see text] mudstone is important to help determine its quality as an economically viable source for shale oil production. In our study, eight dark mudstone core samples from the [Formula: see text] formation were subjected to total organic carbon (TOC), Rock-Eval pyrolysis, X-ray diffraction, scanning electron microscopy (SEM), field emission SEM (FE-SEM), and low-pressure [Formula: see text] gas adsorption (LPGA-[Formula: see text]) experiments. Geochemical and petrological analysis results indicated the presence of a high TOC content, which originated mainly from alginate and some plant-derived organic matter, whereas bitumen was frequently present in mudstones with thermal maturity in the oil-generation stage. The [Formula: see text] mudstones were comprised mainly of clay minerals, followed by quartz, feldspar, and carbonates. The LPGA-[Formula: see text] experiments revealed the presence of nanoscale slit-shaped pores, and the contribution from mesopores to the total pore volume was the highest in most of the samples. The average pore diameters (APDs) of the mudstone samples were all smaller than 20 nm (4.36–17.79 nm). We determined that there was a clear positive correlation between the APD and the free oil content; however, there were no clear correlations between the APDs and the quartz, carbonate, and TOC contents. FEM studies revealed the presence of intergranular pores with widths of approximately 10 μm, micron-level autogenetic organic matter pores within spores, organic matter pores caused by the hydrocarbon generation effect within organic matter or clay-organic complexes, and intraparticle pores within clays or pyrite framboids. The microlevel intergranular pores might play an important role in shale oil accumulation from source rock of lacustrine origin.

Lacustrine shale oil resource potential of Es 3 L Sub-Member of Bonan Sag, Bohai Bay Basin, Eastern China

2017 ◽  
Vol 28 (6) ◽  
pp. 996-1005 ◽  
Author(s):  
Shuangfang Lu ◽  
Wei Liu ◽  
Min Wang ◽  
Linye Zhang ◽  
Zhentao Wang ◽  
...  
Keyword(s):  
Eastern China ◽  
Bohai Bay ◽  
Shale Oil ◽  
Bohai Bay Basin ◽  
Resource Potential ◽  
Bonan Sag ◽  
Lacustrine Shale

The Evaluation of Potential of Shale Oil Resources in K1qn1 Formation of Southern Songliao Basin

2014 ◽  
Vol 1006-1007 ◽  
pp. 107-111
Author(s):  
Yan Wang ◽  
Wen Biao Huang ◽  
Min Wang
Keyword(s):  
Organic Matter ◽  
Source Rock ◽  
Thermal Evolution ◽  
Songliao Basin ◽  
Mature Stage ◽  
Type I ◽  
Hydrocarbon Generation ◽  
Shale Oil ◽  
Oil Resources ◽  
Geochemical Method

Based on the analysis of source rock geochemical index, with K1qn1 Formation of southern Songliao basin as the research objective layer, it’s concluded that the mean TOC value of shale in K1qn1 Formation is higher, generally more than 1%, which belongs to the best source rock. Most of shale organic matter types are type I and type II1. The thermal evolution degree of organic matter is generally in the mature stage: a stage of large hydrocarbon generation. With logging geochemical method applied, the calculated total resources of shale oil in K1qn1 formation are 15.603 billion tons. The II level of resources are 8.765 billion tons, which is more than 50% of the total resources. The I level of resources are 4.808 billion tons while the III level of resources 2.03 billion tons. Overall, the southern Songliao Basin still has a certain degree of prospecting and mining value.

scholarly journals Heterogeneity Characteristics of Lacustrine Shale Oil Reservoir Under the Control of Lithofacies: A Case Study of the Dongyuemiao Member of Jurassic Ziliujing Formation, Sichuan Basin

2021 ◽  
Vol 9 ◽  
Author(s):  
Peng Li ◽  
Zhongbao Liu ◽  
Haikuan Nie ◽  
Xinping Liang ◽  
Qianwen Li ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Clay Minerals ◽  
Specific Surface Area ◽  
Sichuan Basin ◽  
Total Pore Volume ◽  
Nitrogen Adsorption ◽  
Hydrocarbon Generation ◽  
Shale Oil ◽  
Lacustrine Shale

The lacustrine shale in the Dongyuemiao Member of the Fuling area, Sichuan Basin, is widely distributed and has huge shale oil resource potential. It is one of the important replacement areas for shale oil exploration in China. To investigate the key shale oil evaluation well, Well FY10, in the Fuling area, X-ray diffraction (XRD) mineral analysis, Rock-Eval, argon ion polishing-scanning electron microscope (SEM), Mercury injection capillary pressure (MICP), and low pressure nitrogen adsorption were launched to determine the heterogeneity of the pore system in the lacustrine shale of the Dongyuemiao Member. The mineral composition exhibits a high degree of heterogeneity, and the shale can be divided into two main lithofacies: argillaceous shale and mixed shale. The porosity ranges from 2.95 to 8.43%, and the permeability ranges from 0.05 to 1.07 × 10−3 μm2. The physical properties of mixed shale are obviously better than those of argillaceous shale. Inorganic mineral pores, such as linear pores between clay minerals and calcite dissolution pores, are mainly developed, while a small amount of organic pores can be observed. The average total pore volume (Vp) is 0.038 ml/g with an average specific surface area of 5.38 m2/g. Mesopores provide the main Vp (average 61.72%), and micropores provide mostly specific surface area. TOC imposes a strong controlling effect on the development of micropores. Clay minerals are the main contributors to mesopores and macropores. The organic-inorganic interaction during the process of diagenesis and hydrocarbon generation controls the formation of shale pore systems.

scholarly journals Several issues worthy of attention in current lacustrine shale oil exploration and development

2021 ◽  
Vol 48 (6) ◽  
pp. 1471-1484
Author(s):  
Zhijun JIN ◽  
Rukai ZHU ◽  
Xinping LIANG ◽  
Yunqi SHEN
Keyword(s):  
Shale Oil ◽  
Oil Exploration ◽  
Lacustrine Shale ◽  
Exploration And Development

Resource Potential Classification Evaluation of E2S42 Shale Oil in Damintun Depression

2013 ◽  
Vol 848 ◽  
pp. 240-245
Author(s):  
Xin Tong Yan ◽  
Guo Hui Chen ◽  
Hai Tao Xue ◽  
Jin Bu Li ◽  
Xin Wang
Keyword(s):  
Evaluation Criteria ◽  
Hydrocarbon Generation ◽  
Shale Oil ◽  
Resource Potential ◽  
Generation Capacity ◽  
Grade Ii ◽  
Classification Evaluation ◽  
Good Resource ◽  
Sweet Spots ◽  
Damintun Depression

Shale oil resource potential classification evaluation is needed to precisely calculate the resource potential and prepare for the prediction of shale oil sweet spots. Geochemical analysis results shows that the E2S42 shale in Damintun Depression has strong hydrocarbon generation capacity. The classification evaluation criteria of E2S42 Shale oil in Damintun Depression was established according to the triple-division characteristic of measured TOC vs. S1. The shale oil oiliness parameter S1 was obtained by using improved logR method. The loss of hydrocarbon was recovered by chemical kinetics method. Volumetric method was used to calculate different grades of E2S42 shale oil in Damintun Depression. Grade I resource is 334 million tons. Grade II resource is 33 million tons. Grade III resource is 15 million tons. Grade I resource accounts for over 90% of the total resource content. High value area mainly concentrated near Well Shen223 and Well Shen224. Results shows that the E2S42 shale in Damintun Depression has good resource potential.

scholarly journals Enrichment and exploration of deep lacustrine shale oil in the first member of Cretaceous Qingshankou Formation, southern Songliao Basin, NE China

2020 ◽  
Vol 47 (4) ◽  
pp. 683-698
Author(s):  
Junfeng ZHANG ◽  
Xingyou XU ◽  
Jing BAI ◽  
Weibin LIU ◽  
Shan CHEN ◽  
...  
Keyword(s):  
Songliao Basin ◽  
Shale Oil ◽  
Ne China ◽  
Lacustrine Shale
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