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- Title
四棵树凹陷清水河组测井成岩相识别与储层评价.
- Authors
李嘉奇; 鲜本忠; 王剑; 连丽霞; 陈思芮; 贺静
- Abstract
Taking the braided river delta clastic rocks of the Lower Cretaceous Qingshuihe Formation in the Sikeshu sag in the southern margin of the Junggar Basin as the research object, the diagenesis characteristics were analyzed by means of core observation, rock thin section observation, scanning electron microscopy and mercury intrusion experiments. The facies log response relationship is used to identify diagenetic facies and reservoir evaluation. The results show that: the Qingshuihe Formation in the Sikeshu Sag is mainly developed with feldspar lithic sandstone and lithic sandstone, with rich reservoir space types and strong heterogeneity, including coarse pore throats and intergranular pores with good connectivity. It is the main storage space type of the reservoir, and there are also fine pore throats, intragranular dissolved pores and intergranular dissolved pores with low permeability, which belong to ultra-low porosity-ultra-low permeability, ultra-low porosity-ultra-low permeability reservoirs. Four types of diagenetic facies are identified in the study area. Among them, the strongly compacted tight facies are often filled with altered tuffaceous and are developed in the thin sandstone at the channel margin; the calcareous (iron muddy) tight cemented facies are concentrated on the top of the thick sandstone in the main channel of the channel. At the bottom, the pore-throat structure is poor; the tuffaceous dense filling facies developed in the most widely distributed weak dynamic environment, with many intergranular impurities and poor physical properties; the under-compacted dissolution facies mainly developed in underwater distributary channels, with low displacement pressure, Pore structure is the best. The average identification rate of multivariate statistical results of natural gamma, sonic time difference, density, neutron logging and resistivity is 80.6%. The results provide support for the study of coring well logging diagenetic facies, the understanding of the development law of high-quality reservoirs, and the evaluation and optimization of favorable reservoir development zones.
- Subjects
JUNGGAR Basin (China); DELTAS; DIAGENESIS; SCANNING electron microscopy; HETEROGENEITY; ECOLOGICAL heterogeneity
- Publication
Journal of Northeast Petroleum University, 2022, Vol 46, Issue 1, p1
- ISSN
2095-4107
- Publication type
Article
- DOI
10.3969/j.issn.2095-4107.2022.01.001