Open Access厚层灰岩油藏岩溶纵向分带研究
Author(s) -
Quangong Qu,
Jingxuan Zhang,
Youming Lu,
Fang Zhu
Publication year - 2015
Publication title -
petroleum geology and experiment
Language(s) - English
Resource type - Journals
ISSN - 2363-7625
DOI - 10.7603/s40972-015-0003-9
Subject(s) - karst , geology , vadose zone , ordovician , cave , geomorphology , landform , phreatic , geochemistry , carbonate rock , carbonate , aquifer , petrology , groundwater , paleontology , geotechnical engineering , sedimentary rock , archaeology , history , materials science , metallurgy
In district 4 of the Tahe Oilfield, the Ordovician Yingshan Formation was most petroliferous. Marine carbonate rocks with big thickness were widespread. Secondary pores, including dissolution pores, fractures and caves, served as the main reservoir spaces, while primary pores were poorly developed. According to modern karst hydraulic unit theory, a conceptual model of karst was established. Three palaeo-hydraulic zones were identified:vadose zone (including infiltration sub-zone and percolation sub-zone), phreatic zone and tranquil zone. The distribution of reservoirs was described using stochastic seismic inversion technology. The reservoirs were controlled by palaeo-hydraulic zones vertically and karst landforms horizontally, which was proved by field work.