塔里木盆地塔河油田潜山区古岩溶缝洞类型及其改造作用

Paleokarst fracture-vug types and their reconstruction in buried hill area， Tahe oilfield， Tarim Basin

胡文革

Wenge Hu

塔里木盆地塔河油田是典型的岩溶缝洞型油藏，以溶洞和溶蚀缝孔为主要的储集空间，古岩溶缝洞如何划分与分类描述是制约该类油藏精细开发的核心问题。以塔河四区为例，以具有统一的岩溶水流动样式和循环路径为基本原则，研究了岩溶缝洞的成因关联性、缝洞分布控制因素以及缝洞产能特征的差异性，提出了表层型、暗河型和断控型3种类型缝洞划分方案，表征不同的古岩溶缝洞分布特征与发育规律。同时，进一步阐明了构造变化、溶洞垮塌和充填3种古岩溶缝洞的改造作用及规律，表征了改造后的缝洞内部结构及空间分布模式，成功指导了塔河四区储量动用评价和注采井网调整，研究方法对此类油藏高效开发具有重要的指导意义。

The Tahe oilfield in the Tarim Basin contains typical karsr fractured-vuggy reservoirs with caverns and solution fractures and vugs as the major storage space. The classification and description of the paleokarst fracture-vug poses a challenge for the fine development of the oil reservoirs. This study takes the Block 4 in the Tahe area as an example to investigate the genetic correlation， controlling factors of distribution and productivity differences of these karst fracture-vug. Three types of karst fracture-vug， i.e.， epikarst type， underground river type and fault-controlled type， are then proposed based on whether they share unified karst water flow pattern and circulation path. Meanwhile， three processes that have modified the fracture-vug are recognized， i.e.， the architectural transformation， cave collapse and in-filling. The intrinsic architecture and spatial distribution of the fracture-vug are also characterized. Guided by the understandings， a producing reserve assessment and production-injection well pattern readjustment have been successfully carried out in the Block 4， verifying the guiding significance of the study.

10.11743/ogg20220104