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The Study On Rock Physics Analysis For Low-permeability Tight Reservoir

Posted on:2014-04-21Degree:MasterType:Thesis
Country:ChinaCandidate:Q YeFull Text:PDF
GTID:2180330452462360Subject:Earth Exploration and Information Technology
Abstract/Summary:PDF Full Text Request
Tight sandstone oil and gas as a kind of unconventional energy, conventional energyto succeed in the world has played a crucial role. Tight sandstone has low porosity and lowpermeability and complex pore structure characteristics, in terms of experimental analysisor interpretation of the process, due to the deviation of rockphysical parameters and manyuncertain of the cause of the tight sandstone reservoir evaluation. Therefore, to accuratelyobtain the physical parameters of tight sandstone reservoir rock, rock physics research iscrucial, but also has a great challenge and practical value.Rock physics builds a bridge between seismic attributes and reservoir parameters,which not only provides basic knowledge and necessary data for forward and inversionmodeling, but also reduces the risk of seismic interpretation. This paper first summarizesthe petrophysical theory to estimate the modulus of elasticity of the advantages anddisadvantages in the case of low porosity, dense, and lay the foundation for building thepetrophysical model for low permeability tight reservoir. Then builds the tight sand rockphysics model based on rock physics theories with the core data, the well log data, thegeological data and the seismic data, estimates the S-wave velocity for the practical area,and compares the above results with the results computed by the classical Xu-White model,which proves the advantage of the tight sand model. Based on this, this paper studies therelationship between the mineral components of the rock, porosity, the pore fluid, thereservoir space type, and the aspect ratio of the pore and the compressional modulus, theshear modulus, the P-wave velocity, and the S-wave velocity. Finally the paper does AVOforward modelling based on Zoeppritz equations with the obtained P-wave velocity,S-wave velocity and density, analyses the seismic reflectance signatures under the differentmineral components of the rock, porosity, shape of the pore, the reservoir space type, andthe aspect ratio of the pore, provides the necessary information to identify the reservoir anddiscriminate the fluid, and decrease the uncertainty and the ambiguity of the interpretation.
Keywords/Search Tags:Tight sand rocks, Rock physics, S-wave velocity, AVO forwardmodeling
PDF Full Text Request
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