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Effective Reservoir Recognition of Paleogene Trachyte in the Middle Part of the East Sag of Liaohe Depression
详细信息   
摘要
The paleogene trachyte in the middle part of the east sag of Liaohe Depression is abundant in oil and gas, forming the biggest trachyte reservoir, Huangshatuo field in China. There are several kinds of volcanic rocks with heavily changed lithology. The development of the reservoir faces two problems, the recognition of trachyte and its effective reservoir space.  The logging information is used to recognize the lithology. Circumferential Borehole Imaging Log (CBIL) is used to characterize the effective reservoir space. The trachyte has different lithologic chemistry and mineral characteristics from basalt and other volcanic rocks. This difference is the geological ground to distinguish the lithology quantitatively when the correlating charts, including GR-K2 O, GR-C’CNL, GR-po, GR RT, being employed. Four types of effective reservoir space have been identified through CBIL. Based on testing data and logging parameters, three classes of effective reservoir have been identified.

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