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Frontiers in Energy

Front. Energy    2019, Vol. 13 Issue (2) : 354-366     https://doi.org/10.1007/s11708-018-0581-z
RESEARCH ARTICLE
Discovery of Fuling Shale Gas Field and its prospects
Xusheng GUO(), Yuping LI, Jinlei LI, Minggang FENG, Hua DUAN
Exploration Branch, Sinopec, Chengdu 610041, China
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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     
Corresponding Authors: Xusheng GUO   
Just Accepted Date: 13 August 2018   Online First Date: 18 September 2018    Issue Date: 04 July 2019
 Cite this article:   
Xusheng GUO,Yuping LI,Jinlei LI, et al. Discovery of Fuling Shale Gas Field and its prospects[J]. Front. Energy, 2019, 13(2): 354-366.
 URL:  
http://journal.hep.com.cn/fie/EN/10.1007/s11708-018-0581-z
http://journal.hep.com.cn/fie/EN/Y2019/V13/I2/354
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Xusheng GUO
Yuping LI
Jinlei LI
Minggang FENG
Hua DUAN
Fig.1  Correlations between TOC and siliceous contents of shales from Wufeng Formation-Longmaxi Formation in Well JY1 in Fuling Shale Gas Field
Fig.2  Diagram showing TOC, siliceous living creatures and environment judgment of Wufeng Formation-Longmaxi Formation in south-western part of Sichuan Basin (Xiliao Outcrop Profile)
Fig.3  Bitumen pores by crude oil cracking in Longmaxi Formation in Fuling Area
Fig.4  Mode for pressure relief due to structural uplift of carbonic shales from Longmaxi Formation in Well JY1
Fig.5  Curves of porosity, permeability and effective stress of shales at depth 2566.96 m in Well JY2
Fig.6  Relationship between gas contents and pressure coefficients in key shale gas exploration wells in Fuling Shale Gas Field and its neighbor areas
Type/Weight Parameter Weight Point
1.0–0.75 0.75–0.5 0.5–0.25 0.25–0
Quality of mudstones/0.3 Thickness/m 0.1 >40 40–30 20–30 10–20
TOC/% 0.3 >4 4–2 2–1 <1
Kerogen type 0.1 Type Ⅰ Type Ⅱ1 Type Ⅱ2 Type Ⅲ
Maturation(Ro) 0.1 1.2–2.5 1.0–1.2 or 2.5–3.0 0.7–1.0 or 3.0–3.5 0.4–0.7 or 3.0–4.0
Brittle index/% 0.3 >60 60–40 40–20 <20
Geophysical properties/% 0.1 >6 6–4 4–2 <2
Preservation conditions
/0.4
Faults 0.2 Undeveloped Few Developed Well developed
Structural pattern 0.1 Gentle folds Less gentle folds Relatively closed folds Closed folds
Pressure ratio 0.4 >1.5 1.5–1.2 1.2–1.0 <1.0
Cover rocks 0.1 Jurassic-Cretaceous Triassic Permian Silurian
Top and bottom layers 0.2 Very tight Tight Less tight Open/Unconformity
Commercial evaluations
/0.3
Depth/m 0.2 1500–3500 3500–4500 >4500/500–1500 0–500
Resources (1×108 m3) 0.2 >500 200–500 100–200 <100
Production (1×104m3/km) 0.2 ≥10 3–10 0.3–3 < 0.3
Surface conditions 0.1 Areas of plain+ hill>75% Areas of plain+ hill 50%–75% Dominated by low hills Dominated by mountains, plateau and swamp
Water system 0.1 Many rivers with reservoirs Less rivers with reservoirs nearby Water system undeveloped No great rivers
Market pipe net 0.1 Pipe net built Pipe net nearby Pipe net planned No market
Traffic 0.1 Covered by nation and provincial highways Covered half by provincial highways County highways Poor traffic
Tab.1  Evaluation on area favorable for marine shale gas exploration in southern China
Fig.7  Comparisons between Rickman brittle index and new brittle index by multiple parameter model
Fig.8  Sale Reservoirs judged by logging in Well JY1
Fig.9  Results of water saturation in shale reservoirs interpreted by logging in Well JY 5
Fig.10  Model of well structure with three levels
Fig.11  Hook-shape parallel cluster horizontal wells
Fig.12  Great three-axes physical simulation of shales
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