LUO Ping, ZHANG Xing-yang, GU Jia-yu, WANG Sheng-guo, LING Peng. Geophysical Characteristics of Ordovician Reef Outcrops in Tarim B asin[J]. Acta Sedimentologica Sinica, 2003, 21(3): 423-427.
| Citation:
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LUO Ping, ZHANG Xing-yang, GU Jia-yu, WANG Sheng-guo, LING Peng. Geophysical Characteristics of Ordovician Reef Outcrops in Tarim B asin[J]. Acta Sedimentologica Sinica, 2003, 21(3): 423-427.
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Geophysical Characteristics of Ordovician Reef Outcrops in Tarim B asin
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Key Laboratory for Oil and Gas Reservoirs,Research Institute of Petroleum Ex ploration and Development,CNPC,Beijing 100083
- Received Date: 2002-08-21
- Publish Date:
2003-09-10
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Abstract
The Ordovician reefs are important hydrocarbon reservoirs in Tarim Basin. It is significant to explore new methods for the comparative study between outcrop r eefs and those found in wells to understand their size and internal architectu re. Ground penetrating radar (GPR) and gamma-ray spectrometer h av e been used to detect Dawuzitage Hills Ordovician outcrops in Bachu area, Tarim Basin. GPR data indicate that most reefs are flat and lenticular or layered, whi c h is different from what have been found in outcrop surfaces by naked eyes. Smal l patches of reefs or reef bioherms have been widely revealed by high-resolu ti on GPR profiles. The layering character and slant bedding of channel-filled in tr aclasts of reefs are obvious in GPR profiles with the decimeter resolution. The gamma ray value of reef bafflestone is higher than those of sparrenite and sparr udit e, and lower than those of micritic limestone, wackstone, echinoderm grainstone and marlstone. In outcrop gamma-ray curves, reefs are of funneled, bell-shaped or box-shaped and layering feature of reef can also be reflected. The gamma radi oa ctivity of reefs in outcrop and in wells of Lunnan area has similar characterist ics.It provide good method for the comparative study between outcrop r eefs and those found in wells.
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