›› 2012, Vol. 33 ›› Issue (4): 1-1.

   

Classification and Correlation of Lianglitag Fomation of Upper Ordovician in Tarim Basin

CAI Xiyao1,JIN Xianmei2ZHAO Lina2YANG Yufang2ZHU Zhendao2HU Mingyi3   

  1. (1.Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China; 2.Research Institute of Exploration and Development, Northwest Oilfield Company, Sinopec, Urumqi, Xinjiang 830011, China; 3.MOE Key Laboratory of OilGas Resources and Exploration Technologies, Yangtzs University, Jingzhou, Hubei 434023, China)
  • Online:2019-01-01 Published:1905-07-11

Abstract: The stratigraphic classification and correlation in lithology and biostratigraphy and well log interpretation indicate that Lianglitag formation in Tarim basin is an obvious diachronous unit, in which the thinnest is in Tabei area, e.g. Well YM?1 in Shaxi has only 12m in thickness, containing Belodina compressa zone of the bottom of this formation; Well Zhong?2 in Katake uplift has 878 m, indicated by not only Belodina compressa zone, buy also Yaoxianognathus yaoxianensis zone in the top of Lianglitag formation; the thickest is in Tangnan area, 1 271 m thick in Well TN?1.Therefore, Lianglitag formation in Tabei area is corresponding to the Liang?5, Liang?4 members andsome bottom part of Liang?3 of the central uplift zone; the most part of Sangtamu formation assumes heteropic relations with the middle?upper part of Lianglitag formation in Katake and Tangnan. Lianglitag formation in central uplift zone could be divided into 5 lithologic members, but the same member in different wells was not completely isochronal, and the lower 2 members are hiatus in the main part of the uplift zone. By synthetical analyses of the stratigraphy, sedimentary facies and the assemblage of reservoir and cap rocks, the slope breaks in the southern and northern of the uplift zone are considered as the advantageous exploration targets in this area

CLC Number: