Characteristics of Shale Gas Reservoir in Jiyang Depression and its Significance in Drilling and Exploitation

Document Type : Original Article


1 School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong, China

2 Dongsheng Jinggong Petroleum Development Group Co., Ltd., Shengli Oilfield Company, SINOPEC, Dongying, Shandong, China

3 Exploration and Development Research Institute, Sinopec Shengli Oilfield Company, Dongying, Shandong, China


Physical and geochemical characteristics of shale play conclusive role in confirming operation measures during drilling and stimulation. The properties of shale samples from Jiyang depression were investigated through X-ray diffraction, scanning electron microscope, adsorption isothermal, high pressure mercury intrusion, methylene blue trihydrate, pressure pulse decay, tests of specific water wettability and shale stability index. Correlations, geological and engineering significances of them were discussed. Results show that shale reservoir in Jiyang depression has exploitation value corroborated by good characteristic parameters: 2.86% TOC, 69.9% brittle mineral, 26.14% clay mineral, high permeability of 0.011 × 10-3μm2, large Langmuir volume (5.82 cm3/g) and Langmuir specific area (0.91 m2/g), effective porosity (3.77%) and thickness (130.66m). Langmuir specific area is the key control on methane adsorption and storage verified by its moderate positive relativity with Langmuir volumes rather than TOC. High illite content (69.29%) may lead to instability of borehole and velocity sensitivity damage. Microfractures provide channels for filtration, invasion and loss of drilling fluid. Large specific water wettability (4.36 × 10-7g/m2) and smaller shale stability index (19.99 mm) dispalyed that shale formation were unstable once contacting with fresh water. Countermeasures must be adopted during drilling and fracturing to reduce reservoir damage and complex downhole conditions.


  1. Chen S.B., Zhu Y.M., Wang H.Y, Liu H.L, Wei W., Fang J.H., Shale gas reservoir characterisation: a typical case in the southern Sichuan Basin of China. Energy Vol. 36, No. 11, (2011), 6609-6616.
  2. LI Y.X., Nie H.K., Long P.Y., Development characteristics of organic rich shale and strategic selection of shale gas exploration area in China. Natural Gas Ind Vol. 29, No. 12, (2009), 115-118.
  3. Nie H.K., Zhang J.C., Li Y.X., Accumulation conditions of the Lower Cambrian shale gas in the Sichuan Basin and its periphery. Shiyou Xuebao/Acta Petroleum Sinica Vol. 32, No. 06, (2011), 959-967.
  4. Romero Sarmiento, M. F., Ducros, M., Carpentier, B., Lorant, F., Cacas, M. C., Pegaz-Fiornet, S., Wolf, S., Rohais, S., Moretti, I., Quantitative evaluation of TOC, organic porosity and gas retention distribution in a gas shale play using petroleum system modelling: Application to the Mississippian Barnett Shale. Marine and Petroleum Geology Vol. 45, (2013), 315-330.
  5. Wang Y.Y., Ding W.L., Wang Z., etc. Status of Geophysical Logging Evaluation in Shale Gas Reservoir. Geophysics Progress Vol. 30, No. 01, (2015), 228-241.
  6. Klaver J., Desbois G., Urai J., Littke R., BIB-SEM study of the pore space morphology in early mature Posidonia Shale from the Hils area, Germany. International Journal of Coal Geology Vol. 103, (2012):12-25.
  7. Labani M. M., Rezaee R., Saeedi A., Hinai A. Al., Evaluation of pore size spectrum of gas shale reservoirs using low pressure nitrogen adsorption, gas expansion and mercury porosimetry: A case study from the Perth and Canning Basins, Western Australia. Journal of Petroleum Science and Engineering Vol. 112, (2013), 7-16.
  8. Tian H., Zhang S.C., Liu S.B., Zhang H., Determination of organic-rich shale pore features by mercury injection and gas adsorption methods. Shiyou Xuebao/Acta Petroleum Sinica Vol. 33, No. 03, (2012), 419-427.
  9. Środoń J., Quantification of illite and smectite and their layer charges in sandstones and shales from shallow burial depth. Clay Minerals Vol. 44, No. 04, (2009), 421-434.
  10. Akhtarmanesh S., Shahrabi M. J. A., Atashnezhad A., Improvement of wellbore stability in shale using nanoparticles. Journal of Petroleum Science and Engineering Vol. 112, (2013), 290-295.
  11. Yang F., Ning Z.F., Liu H.Q., Fractal characteristics of shales from a shale gas reservoir in the Sichuan Basin, China. Fuel Vol. 115, (2014), 378-384.
  12. Cai Z.C., He L.M., Application of correlation analysis principle in the analysis of library information. Journal of Modern Information, Vol. 5, (2006),151-153.
  13. Ji L.M., Qiu J.L., Yan Q., Zhang T.W., Micro-pore characteristics and of common clay minerals methane adsorption properties electron microscope scanning. Shiyou Xuebao/Acta Petroleum Sinica Vol. 33, (2012), 249-256.
  14. Xu Y.M., He D.M., Shi J.W., Guan J., Zhang Q.M., Preparation of alumina from retorting residue of oil shale. Oil Shale Vol. 29, (2012), 36-50.