مقاله Integrated petrophysical log characterization for tight carbonate reservoir effectiveness: A case study from the Longgang area, Sichuan Basin, China : تی پی بین

خلاصه مقاله

Ultra-low porosity and permeability, inhomogeneous fracture distribution, and complex storage space together make the effectiveness evaluation of tight carbonate reservoirs difficult. Aiming at the carbonate reservoirs of the Da’anzhai Formation in the Longgang area of the Sichuan Basin, based on petrophysical experiments and logging response characteristics, we investigated the storage properties of matrix pores and the characteristics of fracture development to establish a method for the characterization of effectiveness of tight reservoirs. Mercury injection and nuclear magnetic resonance (NMR) experiments show that the conventional relationship between porosity and permeability cannot fully reflect the fluid flow behavior in tight matrix pores. Under reservoir conditions, the tight reservoirs still possess certain storage space and permeability, which are controlled by the characteristic structures of the matrix porosity. The degree of fracture development is crucial to the productivity and quality of tight reservoirs. By combining the fracture development similarity of the same type of reservoirs and the fracture development heterogeneity in the same block, a three-level classification method of fracture development was established on the basis of fracture porosity distribution and its cumulative features. According to the actual production data, based on the effectiveness analysis of the matrix pores and fast inversion of fracture parameters from dual laterolog data, we divided the effective reservoirs into three classes: Class I with developed fractures and pores, and high-intermediate productivity; Class II with moderately developed fractures and pores or of fractured type, and intermediate-low productivity; Class III with poorly developed fractures and matrix pores, and extremely low productivity. Accordingly log classification standards were set up. Production data shows that the classification of effective reservoirs is highly consistent with the reservoir productivity level, providing a new approach for the effectiveness evaluation of tight reservoirs.

نویسندگان

Shaogui Deng [ School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China ]

Yang Wang [ School of Geosciences, China University of Petroleum, Shandong, 266580, China ]

Yunyun Hu [ School of Geosciences, China University of Petroleum, Shandong, 266580, China ]

Xinmin Ge [ School of Geosciences, China University of Petroleum, Shandong, 266580, China ]

Xuquan He [ China Petroleum Southwest Oil and Gas Field Branch, Sichuan, 610051, China ]

کلمات کلیدی

Matrix porosity fracture porosity reservoir effectiveness reservoir classification petrophysical log characterization

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Petroleum Science 2013

Petroleum Science (a journal on petroleum science and technology in the English edition), sponsored by China University of Petroleum, enjoys the assistance of the Science Technology Department of CNPC and three research institutes under the three major oil corporations, CNPC, Sinopec and CNOOC. Petroleum Science is the only English journal in China on petroleum science and technology that is intended for professionals engaged in petroleum science research and technical applications all over the world, as well as the managerial personnel of oil companies. It covers petroleum geology, petroleum geophysics, petroleum engineering, petrochemistry chemical engineering, petroleum mechanics and economic management.

حوزه های تحت پوشش : Mineral Resources, Industrial Chemistry,Chemical Engineering, Industrial and Production Engineering, Energy Economics