Discovery of Fuling Shale Gas Field and its prospects

Abstract

A series of breakthroughs have been made in the understanding, evaluation, and exploration of shale gas from discovery, environmental protection to efficient exploration in the discovering of Fuling Gas Field. By revealing the positive correlation between organic carbon content and siliceous mineral content of shale deposited in deep shelf, dynamic preservation mechanism of “early retention and late deformation,” it is clarified that the shales deposited in deep shelf are the most favorable for shale gas generation, storage and fracturing. The preserving conditions determine the levels of shale gas accumulation, thus the evaluation concept of taking the quality of the shale as the base and the preserving conditions as key is proposed, the evaluation system for strategic selection of favorable zones is established for marine shale gas exploration in Southern China. Moreover, the “sweet point” seismic forecasting technologies for marine shale gas, the “six properties” logging technologies for evaluating shale gas layers, the technologies for quick and efficient drilling of horizontal well groups, and the fracturing technologies for composite fractures for horizontal wells are invented. The paper discussed the exploration prospect of shale gas in the shales of Wufeng-Longmaxi Formation in great depth in Sichuan Basin, shale gas exploration in the outer region of the south, and continental shale gas exploration in China.

Keywords

shale gas / accumulation laws / exploration technologies / Longmaxi Formation / Fuling Shale Gas Field / Sichuan Basin

References

[1] Guo X S. Enrichment Mechanism and Exploration Technologies in Jiaoshiba Area in Fuling Shale Gas Field. Beijing: Science Press, 2014 (in Chinese)

[2] Guo X S, Hu D F, Wen Z D, Major factors controlling the shale gas accumulation and high productivity in marine shales in the Lower Paleozoic of Sichuan Basin and its periphery: taking Wufeng-Longmaxi Formation as an example. Geology in China, 2014, 41(3): 893–901 (in Chinese)

[3] Guo X S, Hu D F, Li Y P, Analyses and thoughts on accumulation mechanism of marine and lacustrine shale gas: taking Longmaxi Formation and Da’anzhai Member of Ziliujing Formation in Sichuan Basin as examples. Earth Science Frontiers, 2016, 23(2): 18–28 (in Chinese)

[4] Nie H K, Bian R K, Zhang P X, Micro-types and characteristics of shale reservoirs of the Lower Paleozoic in southeastern part of Sichuan Basin and their effects on the gas contents. Earth Science Frontiers, 2014, 21(4): 331–343 (in Chinese)

[5] Guo X S. Rules of two-factor enrichment for marine shale gas in Southern China: understandings from explorations and practices for shale gas in Longmaxi Formation in Sichuan Basin and its surrounding area. Acta Geologica Sinice, 2014, 8(7): 1209–1218 (in Chinese)

[6] Liu R B. Typical features of the first giant shale gas field in China. Natural Gas Geoscience, 2015, 26(8): 1488–1498 (in Chinese)

[7] Feng Z Q, Liu D, Huang S P, Carbon isotopic compositions of shale gas in Longmaxi Formation of Silurian in the Changning Area, Sichuan Basin. Petroleum Exploration and Development, 2016, 43(5): 705–713in Chinese)

[8] Barker C. Calculated volume and pressure changes during the thermal cracking of oil to gas in reservoirs. AAPG Bulletin, 1990, 74(8): 1254–1261

[9] Hu D F, Zhang H R, Ni K, Preservation conditions and main controlling factors on shale gas in marine south-eastern part of Sichuan Basin. Natural Gas Industry, 2014, 34(6): 17–23 (in Chinese)

[10] Li T J, Liu H, Liu J X, Geological selection for prospect areas and methods for evaluations on resource Potentials. Journal of Southwest Petroleum University (Science& Technology Edition), 2011, 33(2): 28–34 (in Chinese)

[11] Dong D Z, Cheng K M, Wang S Q, Methods for evaluations on shale gas resources and application in Sichuan Basin. Natural Gas Industry, 2009, 29(5): 33–39 (in Chinese)

[12] Li Y X, Nie H K, You P Y. Features of organic-rich shales and strategic selection of prospect areas in China. Natural Gas Industry, 2009, 29(12): 115–118 (in Chinese)

[13] Fan B J, Shi L, Pang X Q. Characteristics of shale gas reservoirs and conditions for prospecting areas. Petroleum Geology and Recovery Efficiency, 2011, 18(6): 9–13 (in Chinese)

[14] Guo X S, Guo T L, Wei Z H, Thoughts on shale gas exploration and evaluations in southern China. Engineering and Science, 2012, 14(6): 101–105 (in Chinese)

[15] Zhao J Z, Fang C Q, Zhang J, Selection and evaluations on prospecting areas for shale gas exploration in China on the views of shale gas exploration and development in North America. Journal of Xi’an Shiyou University (Natural Science Edition), 2011, 26(2): 1–7 (in Chinese)

[16] Wang S Q, Wang S Y, Man L, Method for selection and evaluations on prospect areas and key parameters. Journal of Chengdu University of Technology (Science & Technology Edition), 2013, 40(6): 609–620 (in Chinese)

[17] Li J, Gao Y, Hua C, Enlightenments for building evaluation methods for selecting prospects areas for marine shale gas in South China by experiences of shale gas exploration in North America. Petroleum Geology and Recovery Efficiency, 2014, 21(4): 23–27 (in Chinese)

[18] Løseth H L, Wensaas M, Gading K, Duffaut K, Springer M. Can hydrocarbon source rocks be identified on seismic data? Geology, 2011, 39(12): 1167–1170

[19] Rickman R, Mullen M J, Petre J E, A practical use of shale petrophysics for stimulation design optimization: all shale plays are not clones of the Barnett Shale. Society of Petroleum Engineers, 2008

[20] Passey Q R, Creaney S, Kulla J B. A practical model for organic richness from porosity and resistivity logs. AAPG Bulletin, 1990, 74(5): 1777–1794

[21] Mallick R K, Raju S V. Thermal maturity evaluation by parts of Upper Assam Basin, India. Organic Geochemistry, 1995, 23(10): 871–879

[22] Sun J G. Archie’s formula: historical background and earlier debates. Progress in Geophysics, 2007, 22(2): 472–486 (in Chinese)

[23] Li X Y, Qin R B, Liu C C. Analyses on effects on calculating reservoir saturation by rock electrical parameters. Journal of Southwest Petroleum University (Science & Technology Edition), 2014, 36(3): 68‒195 (in Chinese)

[24] Li Y G, Lu Z Q, Shi L H, Studies saturation interpretation model based on variable rock-electro parameters. Well Logging Technology, 2015, 39(2): 181–195 (in Chinese)

[25] Zhou X H. Drilling &completion techniques used in shale gas horizontal wells in Jiaoshiba block of Fuling Area. Petroleum Drilling Techniques, 2013, 41(5): 26–30 (in Chinese)

[26] Zhou X H, Zang Y B. Application of “well factory” drilling technology in Fuling shale gas field. Petroleum Drilling Techniques, 2015, 43(3): 46–49 (in Chinese)

[27] Zhang X, Jiang T X, Jia C G, Studies on physical simulation of hydraulic fracturing of shale gas reservoirs. Petroleum Drilling Techniques, 2013, 41(2): 70–74 (in Chinese)

[28] Zhou D H, Jiao F Z, Jia C G, Large-scale multi-stage hydraulic fracturing technology for shale gas horizontal in Well JY1HF. Petroleum Drilling Techniques, 2014, 42(1): 75–80 (in Chinese)

[29] Schettler Jr P D, Parmely C R, Juniata C. Contributions to total storage capacity in Devonian shales. In: SPE Eastern Regional Meeting. Lexington, Kentucky, 1991

[30] Bowker K A. Recent development of the Barnett Shale play, Fort Worth Basin. West Texas Geological Society Bulletin, 2003, 42(6): 1–11

[31] Montgomery S L, Jarvie D M, Bowker K A, Missiissippian Barnett Shale, Fort Worth Basin, north-central Texas: gas shale play with Multitrillion Cubic Foot Potential. AAPG Bulletin, 2005, 89(2): 155–175

[32] Curtis J B. Fractured shale-gas systems. AAPG Bulletin, 2002, 86(11): 1921–1938

[33] Huang Y Z, Huang J L, Ge C M, Technical progresses are key factor promoting rapid development of shale gas exploration in United States. Natural Gas Industry, 2009, 29(5): 7–10 (in Chinese)

[34] Dong D Z, Zou C N, Li J Z, Potentials of shale gas resources and its exploration and development prospects. Geological Bulletin of China, 2011, 30(2‒3): 324–336 (in Chinese)

[35] Zhao W Z, Dong D Z, Li J Z, Potentials of shale gas resources and its future place in natural gas development in China. Engineering and Science, 2012, 14(7): 46–52 (in Chinese)

Acknowledgment

The work was supported by the National Science and Technology Major Project of China (Grant No. 2017ZX05036-001).

RIGHTS & PERMISSIONS

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