Analysis of Total Organic Carbon (TOC), Brittleness Index (BI), Maturity and Seismic Attributes for Characteristics identification of Potential Shale Oil: A Case Study of Talang Akar Formation, Central Ardjuna Basin

2018 ◽  
Author(s):  
Gilang Hamzah Fansury
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Seismic Attributes ◽  
Brittleness Index ◽  
Shale Oil

scholarly journals Evaluation method for resource potential of shale oil in the Triassic Yanchang Formation of the Ordos Basin, China

2020 ◽  
Vol 38 (4) ◽  
pp. 841-866
Author(s):  
Qiulin Guo ◽  
Xiaoming Chen ◽  
Xiaoxue Liuzhuang ◽  
Zhi Yang ◽  
Man Zheng ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Calculation Method ◽  
Evaluation Method ◽  
Ordos Basin ◽  
Oil Yield ◽  
Shale Oil ◽  
Recovery Coefficient ◽  
Evaporative Loss ◽  
Total Oil

The widely distributed, thick Chang 7 Shale is the richest shale oil formation in China. A calculation method for the evaporative hydrocarbon recovery coefficient based on formation volume factor is proposed considering the correction of heterogeneity-based total organic carbon differences to improve the adsorbed oil calculation method, and light hydrocarbon evaporative sampling losses, which can make mobile and total oil calculations more accurate. The adsorbed oil, S1 evaporative loss, total oil yield, and movable oil yield of 200 shale samples from the Chang 7 Member were calculated using the new methods. Results show that S1 evaporative loss accounts for 29% of S1, total oil yield is 3.5 times S1, and movable oil yield accounts for 37% of total oil yield. Based on the calculated total oil yield and movable oil yield results, the relationships among total oil yield, movable oil yield, and total organic carbon of the Chang 7 were established yielding total oil yield and movable oil yield estimates of 11.12 × 109 t and 4.01 × 109 t, respectively, revealing its tremendous shale exploration potential.

Total organic carbon from well logging - statistical approach, Polish shale gas formation case study

2019 ◽  
Vol 22 (2) ◽  
pp. 140
Author(s):  
Marcin Zych ◽  
Edyta Puskarczyk ◽  
Jadwiga A. Jarzyna ◽  
Kamila Wawrzyniak Guz ◽  
Paulina I. Krakowska
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Shale Gas ◽  
Statistical Approach ◽  
Well Logging ◽  
Gas Formation

scholarly journals INTEGRATED OF GEOMECHANICS WELLBORE STABILITY & SWEET SPOT ZONE ANALYSIS TO UNCONVENTIONAL WELL DRILLING OPTIMIZATION

PETRO ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 21
Author(s):  
Allen Haryanto Lukmana
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Shear Failure ◽  
Horizontal Stress ◽  
Wellbore Stability ◽  
Brittleness Index ◽  
Sweet Spot ◽  
Collapse Pressure ◽  
Laboratory Test Results ◽  
Shale Formation

<strong><em>Abstract </em></strong>Central Sumatra Basin is one of the largest hydrocarbon producer basins in Indonesia. The largest hydrocarbons accumulation in this basin does not rule out the possibility of hydrocarbons also trapped in shale source rock. The potential for hydrocarbon shale is in the Brown Shale Pematang Group layer. The obstacle to development is the depth of the Brown Shale layer so deep that further case studies are needed. This study aims to analyze the geomechanical wellbore stability modelling for drilling and determination sweet spot zone supported by x-ray diffraction (XRD), brittleness index (BI), total organic carbon (TOC) analysis. The geomechanical wellbore stability modelling based on pore pressure, shear failure gradient/collapse pressure, fracture gradient, normal compaction trend, minimum horizontal stress, maximum horizontal stress and overburden gradient analysis. Brittleness index considers each parameter from XRD data which dominantly contains clay, quartz, and calcium. Based on XRD analysis of shale samples from Limapuluh Koto Area, it showed that the samples included the brittle shale group because of the dominant quartz, while the samples from Kiliran Jao were shale brittle because of dominant carbonate (carbonate-rich). From laboratory test results of 8 rock samples from Brown Shale Formation outcrop in Limapuluh Koto Area, it was obtained total organic carbon (TOC) value is 4-17% (average 8%). The shale thickness estimated &gt; 30 m, the brittleness index shale estimated 0.71, and the gradient of over-pressure on Brown Sahle Pematang Group estimated 0.57 psi/ft &amp; 0.53 psi/ft from log data analysis. So the output of this results the study is expected to get stable borehole, minimum of non-productive time (NPT), the problem when drilling such as caving and sloughing. Based on (Mt, 2013), the prospect criteria results can be concluded that the Brown Shale Formation has good unconventional hydrocarbon shale potential. It can be carried out with further research.

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