摘要
渤海盆地渤中凹陷BZ21构造区发现了一个10×10~8m^3方级别的古生界碳酸盐岩潜山气藏。根据岩心观察、岩石薄片、铸体薄片、成像测井、常规测井、分析化验及地震等资料,对潜山气藏的储集层演化特征、储集空间类型及形成主控因素进行了分析。研究认为:加里东运动使华北地台整体抬升,形成大型古潜山并长期遭受风化剥蚀,在大气淡水淋滤作用下,形成大量溶蚀孔、洞,水沿着早期岩溶作用所形成的孔隙层渗滤,形成顺层岩溶,改善了储层的横向连通性;碳酸盐岩储层的储集层空间类型主要为溶孔、溶洞及裂缝,成岩作用和构造裂缝是储层的主控因素;碳酸盐岩潜山纵向上可划分为垂直渗流带、水平潜流带及深度缓流带。
One-billion-cubic-meter Paleozoic carbonate buried-hill gas reservoirs are discovered in Structural Area BZ21 of Bozhong Sag of Bohai Bay. According to the following data such as the core observation, rock slices, cast thin sections, imaging logging, conventional loggings, analysis-test, and seismic survey and so on, the reservoir ev- olutional characteristics, AS types and their main controlling factors are analyzed. The studies show that Caledonian orogeny makes the whole uplift of North China Platform and formation of large-size paleo-buried hill and sufferance of long-period weathering and erosion ; under the conditions of the air and fresh water leaches, a great number of dissolved pores and caves are induced, and moreover the karsts along the formations are resulted from the leach of the water along the stimulated porous zones by the early diagenesis, thus the horizontal connectivity of the reservoirs is improved; the AS types of the carbonate reservoirs are mainly dissolved pores, caves and various cracks, the dia- genesis and structural fractures are the principal controlling factors of the reservoirs ; the buried hill can be vertically divided into vertical seepage belts, horizontal undercurrent belts and deep slow-flow belts.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2015年第4期15-20,共6页
Petroleum Geology & Oilfield Development in Daqing
基金
国家科技重大专项"近海大中型油气田形成条件及勘探技术"(2011ZX05023-002)
关键词
渤中凹陷
碳酸盐岩
潜山气藏
储集空间类型
成岩作用
构造裂缝
Bozhong Sag
carbonate rock
buried-hill gas reservoir
accumulation space （ AS ） type
diagenesisstructural fracture
