Volume 39 Issue 6
Nov.  2020
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Zhou Bowen, Chen Honghan, Yun Lu, Tang Daqing. Relationship between argillaceous content and distance to main faulted zone and fractures development in the platform carbonate rocks of Yijianfang Formation in Shunbei area, Tarim Basin[J]. Bulletin of Geological Science and Technology, 2020, 39(6): 93-102. doi: 10.19509/j.cnki.dzkq.2020.0609
Citation: Zhou Bowen, Chen Honghan, Yun Lu, Tang Daqing. Relationship between argillaceous content and distance to main faulted zone and fractures development in the platform carbonate rocks of Yijianfang Formation in Shunbei area, Tarim Basin[J]. Bulletin of Geological Science and Technology, 2020, 39(6): 93-102. doi: 10.19509/j.cnki.dzkq.2020.0609

Relationship between argillaceous content and distance to main faulted zone and fractures development in the platform carbonate rocks of Yijianfang Formation in Shunbei area, Tarim Basin

doi: 10.19509/j.cnki.dzkq.2020.0609
  • Received Date: 10 Jun 2019
  • The exploration of carbonate "fault-karst" reservoirs in Ordovician strike-slip fault zone in Shunbei area of Tarim basin has become a hot spot recently.Multiple drilling wells in Shunbei area of Tarim Basin show that the fault zone and fracture development site generally have unusually high natural gamma logging values.Therefore, according to the parameters of abnormally high shale content, reflect the degree of fracture development, so as to indicate the development location of the reservoir containing mud fault solution.In this paper, the coherent properties of the T74 interface of Shunbei 1 strike-slip fault zone were extracted and interpreted by GeoEast software.Then, according to the natural gamma ray logging data of Yijianfang Formation in 5 Wells, the relationship between the abnormal high shale content of strike-slip fault zone and damage zone of platform carbonate rocks and the distance of main fracture zone and the degree of fracture development was discussed.The results show that the sedimentary environment of carbonate platform in Yijianfang Formation of Ordovician in Shunbei area is stable and the background argillaceous content is low.The argillaceous content at the core and fracture development site of the NE main fault is much higher than the background value of platform carbonate rocks, which decreases with the increase of distance from the PDZ and the decrease of fracture development, and finally approaches its background value.This indicates that the shale content can be calculated by natural gamma ray logging, which indirectly indicates the development degree of "fault-karst" reservoir in strike-slip fault zone.It provides a new thinking for reservoir evaluation of deep and super deep strike-slip fault zone.

     

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