Sedimentary Facies and Logging Parameters of the Lianglitag Formation (Upper Ordovician) from Well Zhong 2, Central High, Tarim Block, Xinjiang, China
详细信息
- 责任者：Zhang Zhili (Research Institute of Petroleum Exploration and Production ; SINOPEC ; Beijing 100083 ; China) ; Cai Xiyao
- 刊名：Acta Micropalaeontologica Sinica
- 出版年：2013
- 卷期：30(1)
- 页码：p.17-28
- issnNo：ISSN1000-0674
- isbnNo：CN32-1189/Q
摘要
The Well Tazhong 2 is situated in the platform margin of the southern slope, Central High, Tarim Block, Xinjiang, China. The Upper Ordovician Lianglitag Formation limestones are dominated by rich intraclastic banks as well as reefal units mainly formed by bindstones of cyanobacteria, calcareous algae together with less metazoanal frameworks of coral and bryozoan. Crinoidal, brachiopoda and trilobite etc. shelly fauna fragments are richly yielded. Several associations of reef and bank are recognized from the sequences, and generally shown as reef complexes with in situ or approximate characteristics taphonomically. The current energy conditions were somewhat changeable and the paleoenvironment maintained a depth above the wave-base. Sedimentary facies and diagenesis remarkably control the forming of the reservoir pattern. Bioclastic limestone, algal bindstone, bafflestone and sandy clastic limestones are mainly considered as the reservoir units. Intragranular dissolved pores, vugs and fractures play key roles for the spaces of reservoirs with less dolomitization. Deep dissolution with strong secondary cementation is an essentially factor for the configuration of the porosity. Nevertheless, units of reef-type are more favorable as the idealized reservoirs than that of the bank-type.
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