摘要
柴达木盆地西南昆北地区和西北东平—牛东地区在基岩及其风化壳中都获得了高产工业油气流,但对于柴达木盆地北缘马海—大红沟地区基岩储层的地质特征认识程度还较低,也缺乏相应的测井评价手段。为此,以该区内D1井为例,结合岩心观察及其实验分析结果,利用常规测井、元素俘获测井、电成像测井及M-N交会图技术对基岩岩性进行了识别研究。结果表明:1马海—大红沟地区基岩岩性存在硅质板岩、石英岩、闪长岩与石英片岩4种类型;2基岩储层段原生孔隙较少,次生孔隙发育,基岩储层属于孔隙型和裂缝-孔隙型储层,储层纵向上的分布不受岩性影响,具有上下"好"中间"差"的特征。
High industrial petroleum was discovered from matrix rock and weathering crust in Kunbei and Dongping-Niudong areas in southeastern and northeastern Qaidam Basin, individually. However, for most matrix-rock reservoirs in Maihai-Dahonggou area of northern Qaidam Basin, the geological features have not been made clear yet. In this study, based on core observation and experimental analysis, we took D1 well as an example, and implemented a lithology identification for the matrix rock by means of a lot of technologies, containing conventional well logging, elemental capture spectroscopy logging, electrical imaging logging, and M-N crossplot. Results show that these matrix-rock reservoirs are composed of siliceous cleaving stone, quartzite,diorite, and quartz-schist; there are a little primary pores but well-developed secondary pores in the reservoirs which belong to porous or fractured-porous ones; and in longitudinal, they can not affected by lithology and appear a feature of better upper and lower, and poor middle.
出处
《天然气勘探与开发》
2016年第3期30-35,44,共7页
Natural Gas Exploration and Development
基金
中国石油天然气集团公司重大科技专项(2011E-0305)"柴达木盆地高原咸化湖盆油气藏测井评价技术攻关"
关键词
柴达木盆地
马海—大红沟地区
基岩
储层
岩性识别
孔隙度谱
测井评价
Qaidam Basin
Mahai-Dahonggou area
matrix rock
reservoir
lithology identification
porosity spectrum
well-logging evaluation
