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Zhou X.,Wuhan University | He S.,Wuhan University | Liu P.,Wuhan University | Ju Y.,Henan Oilfield Branch Company
Earth Science Frontiers | Year: 2016

Based on the data such as cast thin section, scanning electron microscope, X-ray diffractometry and mercury-injection, this paper has researched the micro-pore structure classification and evaluation of tight oil reservoir Chang 6 in Daijiaping area according to the feature and genetic analysis. The results showed that the reservoir space of reservoir Chang 6 is mainly characterized by intragranular dissolved pore and residual intergranular pore, and secondly by intergranular dissolved pore and debris dissolved pore associating with flaky, curved lamellar throat and necking throat mainly. The differences between rock fabric and clastic composition during sedimentation decided the original porosity and permeability, and influenced the diagenesis type and strength in the later stage. The results of the quantity calculation about the influence of diagenesis on reservoir quality suggest that compaction and cement of carbonate are the principal reason causing the damage of primary pore; whereas tectonic compression strengthened the heterogeneity of reservoir pore. We divided the porosity evolution into four stage, such as shallow burial cement, middle burial compaction porosity decrease, deep burial dissolve porosity increase and deep burial cement porosity decrease according to burial history analysis. Based on the correlation analysis among pore structure parameters and physical properties, we selected the largest connected throat radius, the main flow throat radius, sorting coefficient, displacement pressure and median pressure as the basis parameters for classification of reservoir. Further, this paper divides the reservoir of Chang 6 member into four types by Q-cluster analysis, in which I and II types of reservoir pore structure are more favorable to be as development target play. © 2016, Editorial Office of Earth Science Frontiers. All right reserved.

Yang L.-S.,Henan Oilfield Branch Company | Guo Y.,Henan Oilfield Branch Company | Liu W.-H.,Henan Oilfield Branch Company | Lu S.,Henan Oilfield Branch Company | And 2 more authors.
Oilfield Chemistry | Year: 2010

In this paper, the effects of oil flooding efficiency of molecular deposition films (MD), named as OFEMDF, were researched, including such as core permeabililty (67 × 10-3 - 1340 × 10-3 μn2), film concentration (500 - 1500 mg/L), plug dimension (macroscopic and microscopic), absorption time of film(0 - 22 h), the experiment temperatures(50-80°C ) and cationic degree of the film. It was shown that the molecular deposition films could improve oil recovery effectively. The effects of temperature and core permeability on the OFEMDF were smaller. The plug dimension and cationic degrees could cause influence on the OFEMDF to some extent. Higher concentration of MD was helpful to enhance oil recovery. The higher oil recovery was obtained when the concentration of MD was 1500 mg/L, cationic degrees was higher than 24%, the injection volume of films is about 1 PV and the absorption time is above 12 h.

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