Paradox in bulk and molecular geochemical data and implications for hydrocarbon migration in the inter-salt lacustrine shale oil reservoir, Qianjiang Formation, Jianghan Basin, central China

2019 ◽  
Vol 209 ◽  
pp. 72-88
Author(s):  
Xiaoxiao Ma ◽  
Maowen Li ◽  
Xiongqi Pang ◽  
Xueying Wei ◽  
Menhui Qian ◽  
...  
Keyword(s):  
Central China ◽  
Geochemical Data ◽  
Oil Reservoir ◽  
Shale Oil ◽  
Hydrocarbon Migration ◽  
Jianghan Basin ◽  
Lacustrine Shale

Characteristics of shale oil reservoirs in Qianjiang Formation, Qiangjiang Depression, Jianghan Basin, China

2020 ◽  
Author(s):  
Jing Luo ◽  
Furong Wang
Keyword(s):  
Pore Volume ◽  
Salt Lake ◽  
Nitrogen Adsorption ◽  
Oil Reservoirs ◽  
Oil Reservoir ◽  
Shale Oil ◽  
Type Ii ◽  
Salt Rock ◽  
Jianghan Basin ◽  
Shale Oil Reservoirs

<p>The Jianghan Basin is a typical eastern fault depression salt lake basin in China, in which the Paleogene strata of the Qianjiang Sag are rich in shale oil resources. As a salt lake sedimentary basin, the developed Qianjiang Formation is a set of inter-salt oil-bearing strata, in which the salt rock strata are especially developed. There are many salt rhythms in the study area and a salt rhythm consists of a argillaceous dolomite layer between a salt rock formation and a salt rock formation. This study focuses on the 10th rhythm of the Qian 3<sup>4</sup> section of Qianjiang Depression (Eq3<sup>4</sup>10). The samples were investigated by organic geochemical analysis and X-ray diffraction, and the pore structure characteristics of the reservoir were studied by argon ion polishing scanning electron microscope and low temperature nitrogen adsorption test. The research indicates that the average TOC of Eq3<sup>4</sup>10 in Qianjiang Depression is 2.11% and the main distribution is 1%~3%; the type of organic matter is mainly Type II<sub>2</sub> and Type II<sub>1</sub>; the overall maturity of organic matter is low maturity stage(Tmax is 412~441℃with an average of 423℃). The XRD data indicates that the mineral composition of the Qianjiang Formation shale oil reservoir is complex and have strong heterogeneity(quartz content in 2.3%~18.6% with an average of 9.5%, calcite content in 6.9~43.8% with an average of 12.8%, dolomite content in 2.5%~ 61.2% with an average of 27.2%, clay mineral content in 1.0%~45.2% with an average of 20.5%, glauberite content from 7.1% to 92.7% with an average of 22.9%). The pore types of shale oil reservoirs in Qianjiang Sag are complex and diverse and mostly are intergranular pores, which are mainly developed between detrital minerals or between detrital minerals and carbonate minerals. In carbonate mineral particles and quartz particles, some intragranular pores are visible, including calcite dissolution pores, internal pores of calcite and clay minerals, and internal pores of pyrite particles. And organic pores are rare in reservoirs due to the low maturity(Ro ranges between 0.5% and 0.7%). Nitrogen adsorption experiments showed that the pore size distribution of Eq3<sup>4</sup>10 samples was dominated by mesopores and macropores. And the pore volume of the Eq3<sup>4</sup>10 sample was most affected by the macropore pore volume, averaging 66.22%, followed by the mesopore pore volume with an average of 31.45%. To study and understand the characteristics of shale oil reservoir in Qianjiang Depression is conducive to mastering the regularity of shale oil enrichment and provides a basis for the exploration and development of shale oil.</p>

Unravel the Lacustrine Shale Oil Reservoir Potential in China by Integrating Advanced Logging Technologies and Special Core Measurements

2019 ◽  
Author(s):  
Guoqiang Liu ◽  
Yuting Hou ◽  
Junling He ◽  
Hao Zhang ◽  
Jinlong Wu ◽  
...  
Keyword(s):  
Oil Reservoir ◽  
Shale Oil ◽  
Lacustrine Shale ◽  
Reservoir Potential

scholarly journals Pore Characteristics of Lacustrine Shale Oil Reservoir in the Cretaceous Qingshankou Formation of the Songliao Basin, NE China

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 2027 ◽  
Author(s):  
Xiaomeng Cao ◽  
Yuan Gao ◽  
Jingwei Cui ◽  
Shuangbiao Han ◽  
Lei Kang ◽  
...  
Keyword(s):  
Pore Structure ◽  
Fractal Dimensions ◽  
Nitrogen Adsorption ◽  
Songliao Basin ◽  
Oil Reservoir ◽  
Shale Oil ◽  
Pore Characteristics ◽  
Oil Accumulation ◽  
Average Pore ◽  
Lacustrine Shale

Shale oil is hosted in nanopores of organic-rich shales, so pore characteristics are significant for shale oil accumulation. Here we analyzed pore characteristics of 39 lacustrine shale samples of the Late Cretaceous Qingshankou Formation (K2qn) in the Songliao Basin, which is one of the main shale oil resource basins in China, using field emission-scanning electron microscopy (FE-SEM), and low-pressure nitrogen adsorption. We accomplished fractal analysis, correlation analysis using correlation matrix and multidimensional scaling (MDS), and prediction of fractal dimensions, which is the first time to predict pore fractal dimensions of shales. Interparticle pores are highly developed in K2qn. These shales have mesoporous nature and slit-shaped pores. Compared with the second and third members (K2qn2,3), the first member of the Qingshankou Formation (K2qn1) has a larger average pore diameter, much smaller surface area, fewer micropores, simpler pore structure and surface indicated by smaller fractal dimensions. In terms of pore characteristics, K2qn1 is better than K2qn2,3 as a shale oil reservoir. When compared with marine Bakken Formation shales, lacustrine shales of the Qingshankou Formation have similar complexity of pore structure, but much rougher pore surface. This research can lead to an improved understanding of the pore system of lacustrine shales.

scholarly journals Oil Content Prediction Method Based on the TOC and Porosity of Organic-Rich Shales from Wireline Logs: A Case Study of Lacustrine Intersalt Shale Plays in Qianjiang Sag, Jianghan Basin, China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Xin Nie ◽  
Jing Lu ◽  
Jingyuan Chi ◽  
Peilin Wang ◽  
Chaomo Zhang
Keyword(s):  
Experimental Data ◽  
Oil Content ◽  
Volume Fraction ◽  
Prediction Method ◽  
Oil Reservoirs ◽  
Central China ◽  
Shale Oil ◽  
Archie’S Law ◽  
Jianghan Basin ◽  
Shale Oil Reservoirs

Organic-rich shales in between salt rock layers distribute widely in Qianjiang Sag, Jianghan Basin, central China. Due to the complexity of matrix mineral components and their distribution and tight pore structure, Archie’s law cannot be used directly to calculate oil saturation in those shale oil reservoirs. A new oil content model for shale oil reservoirs was introduced. By analyzing the logging and core experimental data from Qianjiang Sag, Jianghan Oilfield, we built the relationship between kerogen and the different well logging porosities including nuclear magnetic resonance (NMR) porosity, neutron porosity, and density porosity. And we used the dual- V sh method to calculate the total organic carbon (TOC). After calculating the volume fraction of the solid organic matters and separating it from the TOC, we acquired the hydrocarbon fluid content in the formations. The calculated oil content results are coherent with the core experimental data, which indicates the efficiency of this model. This model is simple and can be quickly applied. However, this method also shows its weakness in calculation precision when the TOC is not calculated precisely or the quality of the porosity logs is low.

Brittleness evaluation of the inter-salt shale oil reservoir in Jianghan Basin in China

2019 ◽  
Vol 102 ◽  
pp. 109-115 ◽  
Author(s):  
X. Fan ◽  
J.Z. Su ◽  
X. Chang ◽  
Z.W. Huang ◽  
T. Zhou ◽  
...  
Keyword(s):  
Oil Reservoir ◽  
Shale Oil ◽  
Jianghan Basin

scholarly journals Geochemical Evidence for Bedding Parallel Oil Migration in an Inter-Salt Lacustrine Shale Oil Reservoir

2020 ◽  
Author(s):  
Xiaoxiao Ma ◽  
Maowen Li ◽  
Menhui Qian ◽  
Qigui Jiang ◽  
Zhiming Li
Keyword(s):  
Oil Reservoir ◽  
Shale Oil ◽  
Oil Migration ◽  
Geochemical Evidence ◽  
Lacustrine Shale
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