摘要
鄂尔多斯盆地渭北区块地质历史时期受多期构造运动影响,煤体结构复杂。基于研究区钻井煤心和测井资料,分析不同煤体结构的测井响应特征,并按断裂带与非断裂带建立了研究区5号煤层煤体结构的测井识别图版。结果表明,5号煤层纵向上自下而上煤体结构趋于完整;平面上,北区煤体结构主要为碎裂煤和碎粒煤,南区煤体结构相对较完整,局部发育原生结构煤。结合研究区煤层气压裂、排采数据和5号煤层煤体结构及顶板发育情况,分析不同顶板岩性与不同射开比例下的产气效果。结果显示:顶板岩性为砂岩或泥质砂岩时的碎裂煤和碎粒煤储层产气量高于顶板岩性为泥岩或砂质泥岩的产气量。煤体结构越破碎,则顶板射开比例R越高,若煤层顶板岩性为砂岩或泥质砂岩,需增大顶板射开比例。
Coal seam of Weibei block is damaged seriously by multi period tectonic movement and the coal structure is very complicated. Based on core samples and well logging data, this paper analyzed response characteristics of different coal structure and presented logging identification chart of different coal structure of No.5 coal seam in fault zone and non-fault zone. The results show that coal structure of No.5 coal seam tends to be complete from bottom to top. In plane view, the structure of coal in northern area is mainly fractured coal and coal particles. Coal structure of southern area is relatively complete and local is structure coal. According to fracturing and drainage data, and the development of No.5 coal seam roof, this paper makes studies on daily gas production of different roof perforation ratio. When the roof is sandstone or muddy sandstone, gas production of tectonic coal is higher than that of mudstone or sandy mudstone roof. The more crushing the coal structure, the higher the perforation ratio. If the roof of coal is sandstone or muddy sandstone, roof perforated ratio can be higher.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2017年第6期54-59,共6页
Coal Geology & Exploration
关键词
煤体结构
测井评价
压裂特征
射孔段
渭北区块
coal structure
logging evaluation
fracturing characteristic
perforation layer
Weibei block
