DETERMINATION OF SHALE GAS POTENTIAL OF NORTH SUMATRA BASIN: AN INTEGRATION OF GEOLOGY, GEOCHEMISTRY, PETROPHYSICS AND GEOPHYSICS ANALYSIS

A detailed combined geological and geophysical study in North Sumatra basin has shown that prospective formations for shale play containing gas sweet spots are found to be in shales from Bampo, Belumai, and Baong Formations. Bampo Formation exhibits low shale gas potential with very low to medium in organic material contents, maturity index of immature to mature, and moderate brittleness. Rocks within the formation tend to be reactive to highly reactive to water, with a moderate degree of swelling capacity. Porosity varies within 5.8 - 7.4 % with permeability ranging from 0.37 to 3.2 mD. Sweet spots in the formation found around Basilam-1 and Securai-1wells occupy about 21% of the formation. On the other hand, Belumai Formation shows moderate to good shale gas potential, with low to high organic material contents, immature to mature levels of maturity, and moderately brittle to brittle. Sweet spot areas in the formation found around the two wells are about 29% of the formation. For Baong Formation, analysis reveals moderate to good shale gas potential, with low to medium contents of organic material, immature to mature in maturity index, moderately brittle to brittle in brittleness, and tendency of being reactive to highly reactive to water but with low degree of swelling capacity. Sweet spots in the formation found around the two wells occupies are roughly 11% of the total formation volume in the area. Basin modeling leading to gas resources estimation for Baong, Belumai and Bampo Formations has led to estimated volumes of 6,379 TCF, 16,994 TCF, and 25,024 TCF, respectively, with a total amount of 48,397 TCF. The resources figures are speculative in nature and do not incorporate any certainty and efficiency factors.

Download Full-text

Shale Gas Potential Of Lower Baong Formation, north Sumatra Basin : A Case Study Of Unconventional Energy

10.29118/ipa.0.13.sg.121 ◽

2018 ◽

Author(s):

Satria Ardhi

Keyword(s):

Shale Gas ◽

Gas Potential ◽

North Sumatra

Download Full-text

Indications of the Potential of Shale Gas for Non-Conventional Energy Sources in Indonesia

Tadulako Science and Technology Journal ◽

10.22487/sciencetech.v2i1.15553 ◽

2021 ◽

Vol 2 (1) ◽

pp. 17-25

Author(s):

Fandika Agustiyar

Keyword(s):

Shale Gas ◽

Fossil Fuels ◽

Research Study ◽

Energy Sources ◽

Maturity Level ◽

The North ◽

Gas Potential ◽

Central Sumatra ◽

Geochemical Method ◽

North Sumatra

Shale Gas is a potential non-conventional energy source to be developed. However, currently shale gas has not been developed optimally in Indonesia. Therefore, the authors aim to help develop the potential of shale gas by indicating the potential for distribution in Indonesia. The research study was conducted by reviewing literature sourced from literature such as journals, articles and books. Based on the research conducted, potential shale gas reserves are found in the North Sumatra Basin, Central Sumatra Basin and South Sumatra Basin. Geochemical method which includes parameters of Total Organic Carbon (TOC), type of kerogen and maturity level (Ro) used to develop shale gas potential in an area. Shale gas can be a substitute for conventional fossil fuels, so further studies are needed so that it can be produced commercially

Download Full-text

Review for "Properties and shale gas potential of continental shales in the Jurassic Mohe Foreland Basin, northern China"

10.1002/gj.3884/v2/review2 ◽

2020 ◽

Author(s):

Wei Duan

Keyword(s):

Shale Gas ◽

Northern China ◽

Gas Potential

Download Full-text

Decision letter for "Properties and shale gas potential of continental shales in the Jurassic Mohe Foreland Basin, northern China"

10.1002/gj.3884/v1/decision1 ◽

2020 ◽

Keyword(s):

Shale Gas ◽

Northern China ◽

Gas Potential

Download Full-text

Using Seismic Data to Predict Shale Pore Pressure and Overpressure Sweet Spots: A Case Study from the Lower Silurian Longmaxi Formation in Sichuan Basin, China

10.2118/208098-ms ◽

2021 ◽

Author(s):

Sheng Chen ◽

Qingcai Zeng ◽

Xiujiao Wang ◽

Qing Yang ◽

Chunmeng Dai ◽

...

Keyword(s):

Prediction Model ◽

Wave Velocity ◽

Shale Gas ◽

Seismic Data ◽

P Wave ◽

Formation Pressure ◽

S Wave ◽

P Wave Velocity ◽

New Formation ◽

Sweet Spots

Abstract Practices of marine shale gas exploration and development in south China have proved that formation overpressure is the main controlling factor of shale gas enrichment and an indicator of good preservation condition. Accurate prediction of formation pressure before drilling is necessary for drilling safety and important for sweet spots predicting and horizontal wells deploying. However, the existing prediction methods of formation pore pressures all have defects, the prediction accuracy unsatisfactory for shale gas development. By means of rock mechanics analysis and related formulas, we derived a formula for calculating formation pore pressures. Through regional rock physical analysis, we determined and optimized the relevant parameters in the formula, and established a new formation pressure prediction model considering P-wave velocity, S-wave velocity and density. Based on regional exploration wells and 3D seismic data, we carried out pre-stack seismic inversion to obtain high-precision P-wave velocity, S-wave velocity and density data volumes. We utilized the new formation pressure prediction model to predict the pressure and the spatial distribution of overpressure sweet spots. Then, we applied the measured pressure data of three new wells to verify the predicted formation pressure by seismic data. The result shows that the new method has a higher accuracy. This method is qualified for safe drilling and prediction of overpressure sweet spots for shale gas development, so it is worthy of promotion.

Download Full-text

Estimation of original kerogen type and hydrogen index using inorganic geochemical proxies: Implications for assessing shale gas potential in the Devonian Horn River Formation of western Canada

AAPG Bulletin ◽

10.1306/0329181524617100 ◽

2018 ◽

Vol 102 (10) ◽

pp. 2075-2099

Author(s):

Sung Kyung Hong ◽

Young Jae Shinn ◽

Jiyoung Choi ◽

Hyun Suk Lee

Keyword(s):

Shale Gas ◽

Hydrogen Index ◽

Western Canada ◽

Geochemical Proxies ◽

Kerogen Type ◽

Gas Potential

Download Full-text

Lithofacies, Depositional Environment and Diagenetic Evolution of the Paleocene Patala Formation, Potwar Basin, Pakistan: Implication for Shale Gas Potential

10.5194/egusphere-egu21-12555 ◽

2021 ◽

Author(s):

Nasar Khan ◽

Rudy Swennen ◽

Gert Jan Weltje ◽

Irfan Ullah Jan

Keyword(s):

Organic Matter ◽

Shale Gas ◽

Gas Reservoirs ◽

Shallow Marine ◽

Anoxic Conditions ◽

Fine Grained ◽

Potwar Basin ◽

Diagenetic Evolution ◽

Reservoir Assessment ◽

Gas Potential

Abstract: Reservoir assessment of unconventional reservoirs poses numerous exploration challenges. These challenges relate to their fine-grained and heterogeneous nature, which are ultimately controlled by depositional and diagenetic processes. To illustrate such constraints on shale gas reservoirs, this study focuses on lithofacies analysis, paleo-depositional and diagenetic evolution of the Paleocene Patala Formation at Potwar Basin of Pakistan. Integrated sedimentologic, petrographic, X-ray diffraction and TOC (total organic carbon) analyses showed that the formation contained mostly fine-grained carbonaceous, siliceous, calcareous and argilaceous siliciclastic-lithofacies, whereas carbonate microfacies included mudstone, wackestone and packstone. The silicious and carbonaceous lithofacies are considered a potential shale-gas system. The clastic lithofacies are dominated by detrital and calcareous assemblage including quartz, feldspar, calcite, organic matter and clay minerals with auxiliary pyrites and siderites. Fluctuations in depositional and diagenetic conditions caused&#160; lateral and vertical variability in lithofacies. Superimposed on the depositional heterogeneity are spatially variable diagenetic modifications such as dissolution, compaction, cementation and stylolitization. The &#948;13C and &#948;15N stable isotopes elucidated that the formation has been deposited under anoxic conditions, which relatively enhanced the preservation of mixed marine and terrigenous organic matter. Overall, the Patala Formation exemplifies deposition in a shallow marine (shelfal) environment with episodic anoxic conditions.Keywords: Lithofacies, Organic Matter, Paleocene, Potwar Basin, Shale Gas, Shallow Marine.

Download Full-text