古潜山岩溶储集层特征及其对产能的控制作用  

Buried hill karst reservoirs and their controls on productivity

作　　者：王进财[1] 赵伦[1] 张祥忠[1] 杨智刚 曹海丽[1] 陈礼[1] 单发超 刘明慧[1] 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油哈萨克斯坦公司

出　　处：《石油勘探与开发》2015年第6期779-786,共8页Petroleum Exploration and Development

基　　金：中国石油天然气集团公司重大专项(2011E-2506)

摘　　要：以哈萨克斯坦南图尔盖盆地NWKK碳酸盐岩油田为例,建立了古潜山岩溶储集层概念模型,从纵向上和平面上分析了储集层特征及其对产能的控制作用。纵向上,岩溶储集层自上而下可划分为风化壳带、表层带、洞穴带、渗流带和潜流带,裂缝发育程度依次增强;发育角砾孔隙型、洞穴型、孔洞型、裂缝-孔洞型、裂缝-孔隙型、孔隙型等6类储集层类型,裂缝和溶洞的发育使各岩溶带生产初期高产油低含水,但产量递减及含水上升快。平面上,岩溶储集层特征受控于构造海拔高度和古岩相特征:构造海拔高、岩性疏松的古潜山储集层受地表风化淋滤作用强,溶孔溶洞较发育,储集层类型主要为角砾孔隙型、洞穴型和孔洞型;构造海拔低、岩性致密的古潜山储集层裂缝发育程度高,储集层类型主要为裂缝-孔洞型和裂缝-孔隙型,储集层与底水沟通作用强,产能效果好,但产量递减及含水上升快,平面不同区域应采用不同的开发技术政策。The concept model of ancient buried hill karst reservoirs was built taking the NWKK carbonate rock oilfield in the South Turgay Basin in Kazakhstan as an example, and the characteristics of karst reservoirs and their controls on productivity were analyzed in vertical and horizontal directions. Vertically, the karst reservoirs can be subdivided into, from top to bottom, weathering crust zone, epikarst zone, caves zone, vadose zone and phreatic zone, in which the development of fractures is strengthened gradually; Six reservoir types, breccia pore, cave, vug, fracture-vug, fracture-pore and pore, were developed; Each karst zone has high oil production and low water cut in the initial stage because of the developed fractures and karst caves, but the production declines rapidly and the water cut rises fast. Horizontally, the karst reservoir characteristics are controlled by structure altitude and ancient lithofacies： the ancient buried hill with high structure altitude and loose lithology suffers from stronger weathering and leaching, has much more solution caves and holes, the main reservoir types are breccia pore, cave, and vug, while the ancient buried hill with low structure altitude and compacted lithology has highly developed fractures and stronger communication with bottom water, the main reservoir types are fracture-vug and fracture-pore, and the reservoirs have better productivity effect but rapid production declines and water cut rising. Different areas in plane should adopt different development techniques and policies.

关 键 词：古潜山 岩溶储集层 储集层特征 储集层概念模型 产能特征 南图尔盖盆地 

分 类 号：TE348[石油与天然气工程—油气田开发工程]