Shale Gas Reservoir Characteristics in South Sicuan Basin. Mr. Liu Honglin,Deputy Director CNPC Research Institute of Petroleum E &D

Transcription

1 Shale Gas Reservoir Characteristics in South Sicuan Basin Mr. Liu Honglin,Deputy Director CNPC Research Institute of Petroleum E &D Sep. 2012

2 Outline Shale Gas Geologic Background of South Sicuan Shale Gas Reservoir Characteristic of South Sicuan Outlook of South Sicuan Basin Shale Gas 2 37

3 1.1 Gas in Place evaluating results in sicuan basin and its adjacent Lots of exploration activities focus on southern marine shale around sicuan basin and adjacent area Item Statistic of exploration Outcrop measuring Shallow exploration well 2D seismic Shale outcrop 220,of 20 measured, 5319 meter long 22 wells, bootage 7293m,core 4709m 5641km 3D seismic 358km 2 Appraisal well Wells fractured and tested Vertical 16 wells(including 1 drilling),horizontal well 4 11 wells,13 strata 3 37

4 1.2 Of two favorable target shale, Silurian longmaxi formation better Six marine shale occurs in southchina, Silurian longmaxi formation with higher TOC, thicker and higher potential Strata column of southchina TOC and Thickness of marine shale in southchina Strata or formation TOC,% Ro% Thickness m Permian 0.34~ ~ ~200 Devonian 0.27~ ~ ~250 Silurian 1.88~ ~ ~500 Ordovician 0.16~ ~ ~300 Cambrian 1.50~ ~ ~400 Sinian 0.19~ ~ ~

5 1.2.2 longmaxi formation located in paleo-yangzi platform Thicker than 100 m, over 200,000 km 2, but intensive tectonic deformation, Buried deeper or expose to surface Basin center, syncline, monoclinic area is favorable shale gas areas Isopach map of longmaxi marine shale in south china 中 国 南 方 地 区 志 留 系 龙 马 溪 组 页 岩 厚 度 分 布 图 三 公里 江 造 山 带 雅安 龙 昆明 门山推覆带 成都 陆川中古 2.6 万 km 滇黔桂古 250 陆 万 km 贵阳 秦岭 100 雪峰古陆 南宁 大 别 山 50 山 长沙 山带造 山 带 100 武汉 南昌广州 万 km 杭州 台湾海峡 上海 志留系 5 37

6 uncertainty potential of lacaustrine and transitional facies shale gas Lacaustrine and trasitional facies shale map 塔木盆地里准噶尔盆地地盆鄂尔多斯地盆松辽地四川盆盆地湾渤海盆地塘羌柴盆地达木盆地东海盆地珠江口盆地莺歌海二连盆地盆地吐哈 Lacaustrine facies shale map 塔木盆地里准噶尔盆地地盆鄂尔多斯地盆松辽地四川盆盆地湾渤海盆地塘羌柴盆地达木盆地东海盆地珠江口盆地莺歌海二连盆地盆地吐哈 Relative continuous distribution and small thickness, low brittleness and uncertainty about quantity. No successful case Of the total shale gas resource, China lacaustrine and transitional facies shale gas accounting for 40%, released by China land and Resource Ministry in 2011

7 1.3 Longmaxi shale in sunan area is the most favorable The lower part of longmaxi formation, dark shale TOC over 2% has a stable distribution with thickness meter. 7 37

8 Comparing with USA, similarity in main reservoir parameters Looks likes Haynesville shale Reservoir parameter Barnett Marcellus Eagle Ford Haynesville Sunan C 1 D 2 K J 3 S 1l Thickness (m) TOC (%) Press. Gradient Brittle mineral content (%)

9 1.4 Suitably buried, relative stable tectonic background and over-pressure is core area Three core area confirmed after drilling weiyuan Fusun-yongchuan chuangning Weiyuan Area:7000km 2 Depth: m Core area: 4500km 2 changning Area: 4230km 2 Depth: m Core area:2000km 2 Fushun-yongchuan Area:3819km2 Depth: m Core area:2500km2 9 37

10 The statistic table of press. Gradient in sunan area area well Formation Press. gradient weiyuan Changning Fusunyongchuan V1 qiongzhusi longmaxi V2 longmaxi 1.4 V3 longmaxi 1.6 M1 longmaxi 1.9 longmaxi 2.03 M2 longmaxi 1.35 M3 longmaxi 2.03 Z101 longmaxi 2.14 N101 longmaxi 2.19 G01 longmaxi 2.15 M101-H longmaxi 2.08 U101-H longmaxi

11 Outline Shale Gas Geologic Background of South Sicuan Shale Gas Reservoir Characteristic of South Sicuan Outlook of South Sicuan Basin Shale Gas 11 37

12 2.1 Longmaxi shale reservior characteristics in sunan Sedimentary environment and lithology The lower Paleozoic longmaxi formation shale, continental shelf with widely distributed and stable deposit Longmaxi formation thickness:100~400m, 150~300m in sunan Deep water continental shelf facies in South sicuan and east sican-west Hubei 12 35

13 Haynesville paleogeography Modified from Sharp (2009) Cotton Valley Bossier Formatio n Haynesvil le Shale Smackov er Formatio n Upper Jurassic Organic Shale Compared with Haynesville shale, the similarity of shale are stagnant continental shelf facies The difference existed in much more carbonate deposits around in Haynesville shale 13 35

14 Haynesville shale deposit model Modified from Brittenham (2010) Rich Organics conclusion:similarity in sedimentary environment, but more carbonate deposits in Haynesville shale with higher debris of carbonate, intragrain pore more developed, that lead to a higher porosity 14 35

15 Microfrature in shale Well M2, S 1 l, thin section,dark shale M1,S 1 l,thin section, Asphalt and Calcite films 15 35

16 2.1.2 Maturity of longmaxi shale Sunan longmaxi F.M. After correcting, Ro 2.8%-3.2% Haynesville % High maturity in the two shale 16 35

17 2.1.3 Porosity and permeability Higher matrix permeability and lower porosity in the two shale M1 井 17 35

18 Gas saturation 60-80% in the two shale, sunan lower 差 好 M1 井 18 35

19 2.1.4 Rock brittleness and Yang s module More brittle than Haynesville M1 井 19 35

20 2.1.5 Thickness of High TOC The thickness of TOC over 3% in Haynesville shale located in over pressure area. 45m in average Sabine Island Complex Pollastro (in preparation);toc generalized from Moore et al. (2010) 20 35

21 In sunan, hot shale (TOC>2%) ranged from m,looks likely 33.4m 48m 46m 46m 38m 21 35

22 2.1.6 The proportion of free and adsorbed gas Higher free gas than Barnett shale Lower free gas than Haynesville shale 22 35

23 Conclusion:Sunan longmaxi shale is similar to Haynesville shale,over pressure shale gas reservoir Similar:higher free gas proportion Difference:lower porosity than Haynesville, higher maturity and lower carbonate debris content Haynesville shale 23 35

24 2.2 typical well production and reserve analysis well M1 fraturing result well M1 staged fracturing, the first to the fourth period of fracture distribution in the main reservoir lower limestone, not in the target zone formation volumetric fracture network, fifth to tenth forming network system. Longmaxi shale within the complex network of fractures developed well, beneficial to improve the productivity; but the complexity of the existence of cracks

25 2.2.2 Well M1 production After plug drilled, 48 hours before using 3mm/4mm nozzle spraying nozzle size, then gradually increase to 7mm /8mm nozzle, pressure from 48MPa to the current 25 MPa. M1 production rate Gas rate,10.23~16.80* 10 4 m 3 /d, average 14.13*10 4 m 3 /d Water rate,37m 3 /d 25 35

26 As of May 11th, the cumulative discharge 2874m3, total fluid volume 12.98% 26 35

27 Characteristics Gas flow early, a large quantity of gas, pressure high, is a typical overpressure gas reservoir, development potential is great ( resource abundance million /km2 ); Water production from the initial 360 / day, reduced to / day, chlorine ion content data is fracturing fluid flowback, instead of formation water; Volume by the nozzle size effect, nozzle size from 8mm to 7mm, gas production from the / day to / day, pressure from 24Mpa to 27Mpa; Fracturing fluid flowback rate around 10% to gas production peak, average daily gas , compared to the United States, in the middle level

28 2.3 Well M1 EUR forecasting EUR based on microseismic The single well control area 1.43km2, overall fracturing volume estimation of about cubic meters According to the content of 3m3/t, 2.6t/m3 density calculation of single well controlled reserves of cubic meters. According to the recovery of 20% calculation, single well ultimate recoverable reserves of cubic meters

29 2.3.2 Through the decline analysis estimated ultimate recoverable reserves gas production of m3 Based on production decline curve forecasting recoverable reserves of m3( yield limit 1000 / day ) 日产量 10 3 m 3 / 天 M1 gas decline curve 29 35

30 2.3.3 EUR estimate by favorable well displacement Single well controling area:1145m 300m(well space)= 0.34km2 EUR:1145m 300m 46m 2.6t/m3 3m3/t = 1.23*108m3 300m 30 35

31 Outline Shale Gas Geologic Background of South Sicuan Shale Gas Reservior Characteristic of South Sicuan Shale Gas Outlook of South Sicuan Basin 31 35

32 3.1 Marine shale in sicuan has higher potential, compare with USA commercial shale parameters Barnett Marcellus Eagl e Ford Haynesville N1 M1 M2 longmaxi qiongzhusi longmaxi depht(m) Thickness,m Reservoir Temp.( ) TOC(%) Ro(%) Porosity(%) Gas content(m 3 /ton) ~ Adsorbed gas(%) Reservoir Press.(MPa)

33 3.2 A large amount of Shale gas resource, preliminary estimate CNPC(2011) Gas in place (Trillion 3 ) Abundance of Gas resource (10 8 m 3 /km 2 ) F.M. area Shale area (km 2 ) thickness (m ) P90 P10 P90 P10 qiongz husi Shallower than 4000m ~ Full basin longm axi Shallower than 4000m Full basin In total Shallower than 4000m Full basin

34 3.3 Successful Pilot testing confirmed the potential in sicuan Resource Abundance of weiyuan longmaxi : m3/Km2, GIP,360.1 bcm; Resource Abundance of weiyuan qiongzhusi: m3/Km2, GIP,886 bcm Resource Abundance of changning longmaxi: m3/Km2, GIP,bcm 34 35

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