Petroleum Science >2013,??Issue 3:??336-346 DOI: https://doi.org/10.1007/s12182-013-0282-5
Integrated petrophysical log characterization fortight carbonate reservoir effectiveness: A case studyfrom the Longgang area, Sichuan Basin, China Open?Access
文章信息
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China 2 School of Geosciences, China University of Petroleum, Shandong 266580, China;2 School of Geosciences, China University of Petroleum, Shandong 266580, China 3 China Petroleum Great Wall Drilling Geological Research Institute, Liaoning 124000, China;2 School of Geosciences, China University of Petroleum, Shandong 266580, China;2 School of Geosciences, China University of Petroleum, Shandong 266580, China;4 China Petroleum Southwest Oil and Gas Field Branch, Sichuan 610051, China
文章摘要
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.
關鍵詞
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Matrix porosity, fracture porosity, reservoir effectiveness, reservoir classification,petrophysical log characterization