Study On The Rock Physics Properties Of Glutenite Reservoir About Dongying North Actic Region

Based on the previous study, using rock physics theory as a guide, rock experiment as a means, experimental data statistics and analysis as methods, rock physical properties of glutenite reservoir on the east area of Dongying north actic region was further studied, which mainly include rock physical experiment designing, data analysis, forward modeling, researching about reservoir properties and elastic change of rock mechanism.According to the research purposes, the rock physical experiments have been designed as follows:①Core sampling.②Physical parameters experiments, including porosity, permeability and density tests.③Rock electrical parameters experiment, mainly testing the resistivity on condition that rock is saturated 100% by water.④Elastic parameters experiments, testing acoustic wave velocity on condition that rock is imposed by high temperature and high pressure, saturated by different fluid. And next to calculate the elastic moduli.⑤Lithology parameter experiments, including X-diffraction and cast thin section analysis.⑥pore structure parameters experiments, including mercury penetration and NMR experiments. The detailed experimental data have been got through the above process, and which are foundation of rock physical analysis later.According to the experiment data, the rock physical characteristics of glutenite reservoir have been researched further. First, the microscopic characteristics about glutenite reservoir which is classified according to experimental data (physical parameters, lithology parameters, pore structure) have been researched. We found that low porosity and low permeability is the main feature of it. The controlling factors affecting the reservoir properties have been studied. And we found that mechanical compaction and cementation are the main control factors reducing the porosity and permeability, dissolution improving the reservoir properties, respectively. Second, the regional empirical formula have been got through experiment data (physical parameters, electrical parameters, acoustic velocity), which includes porosity vs. density, porosity vs. permeability, porosity vs. velocity, density vs. velocity, resistivity vs. velocity, and other parameters relationship. Generalized Gardner formula (ρ=CVpAVsB) fitted by density and velocity relationship of different lithology has an important role to guide the region wave velocity prediction, rock physics forward simulation, AVO inversion etc. Third, this paper has a study on the rock physics forward modeling, seismic wave prediction of the reservoir. Biot's coefficient of different lithology getted by experimental data is put into relationship of porosity and elastic moduli to predict the rock elastic moduli after the rock saturated by fluid and also rock wave velocity. The predicted data is consistent with the experimental results. Fourth, this paper has a study on deagenesis and rock structure on rock elastic effects. The qualitative or quantitative relationship has been built using the experimental results about sedimentary characteristics of rock reservoir (diagenesis, rock structure, etc.) and seismic elastic properties. The last, the influence of pressure and fluid to rock elastic characteristics is analysed. Sensitivity after rock saturated by fluid is also analysed and the fluid sensitivity factor is established. Research shows that most of rocks have an obvious distinction in the condition of gas-fluid state (dry or liquid saturated). The distinction of the two state is not obvious in general when rock is saturated by water or oil.