CHARACTERISTICS OF HYDROTHERMAL-STRUCTURE-CONTROLLED FRACTURE-VUG DOLOMITE RESERVOIR AND ITS INFLUENCE ON OIL-WATER DISTRIBUTION: А CASE STUDY ON THE LOWER CRETACEOUS, BAIYINCHAGAN SAG, ERLIAN BASIN, NORTH CHINA
Zhicheng Lei1, Wangshui Hu2, Huaimin Xu1, Bo Xu3, Chun Cao4, Chao Cheng3, Qulei Zhu1
1College of Geoscience, China University of Petroleum-Beijing, Beijing, China
2College of Geoscience, Yangtze University, Wuhan, Hubei, China
3CNOOC China Co., LTD. Shanghai branch development production, Shanghai, China
4CNOOC EnerTech-Drilling&Production Co, Data Processing Co. Zhanjiang, Guangdong, China
Keywords: Гидротермальный доломит, трещинно-полостной коллектор, распределение нефти и воды, Северный Китай, бассейн Эрлиан, Hydrothermal dolomite, fracture-vug reservoir, oil-water distribution, North China, Erlian Basin
Abstract
Fractures and vugs were used as the primary dolomite reservoir space in the study area, which improved the reservoir’s physical properties and influenced the distribution pattern of oil and water that were developed in the Upper Tenger Formation, Lower Cretaceous, Baiyinchagan sag, Erlian Basin. Based on the core observation data, thin slice analysis, and image logging, the cave-fractured reservoir was primarily developed in the actic region near the side of a depositional fault. Tectonic and diagenetic fractures were the primary types of fractures. High-angle tectonic fractures in the closure and open status were developed well in dolomitic mudstone, while a low-angle fracture and reticulate fractures were developed in the tectonic-hydrothermal hybrid process and were filled with hydrothermal minerals. The reservoir was located in low-lying land; therefore, detrital grain pressolution fractures were formed by burial diagenesis. Intergranular and intrangranular dissolved pores, which were formed by hydrothermal activity, were developed primarily in the highly dolomite lithology. According to the diagenesis temperature of dolomite from a carbon-oxygen isotope analysis, multiple hydrothermal fluid injection events occurred, and dolomitization ensued before massive hydrocarbon migration. The dissolution of organic acids formed by hydrocarbon charges after dolomitization and inorganic acid produced by burial diagenesis for soluble minerals effectively promoted the reservoir properties. Strong heterogeneity due to lithology and fracture-vug systems led to intricate oil-water relationships. Four statuses occurred, including cave-fracture oil, isolated oil, stored oil, isolated water, and stored water. The oil-water distribution patterns were established based on the core observation.
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