石油化工高等学校学报2016，Vol.29Issue(6)：66-71,6.DOI:10.3969/j.issn.1006-396X.2016.06.014
吴起-志丹地区致密油成藏主控因素研究
Main Control Factors of Tight Oil Accumulation in WuQi and ZhiDan Area
摘要
Abstract
WuQi and ZhiDan area is located in the central-western of North Shaanxi Slope,Ordos Basin.The exploration indicates that Chang 7 Member in YanChang Formation of Triassic developed a set of low permeable tight sandstone reservoirs which were formed in lake-delta front facies environments,and the tight oil resource was rich.Based on kerogen learnt, vitrinite reflectance determination,pyrolysis method,the organic type,abundance and maturity were studied.At the same time the microstructure of tight oil reservoir was researched according to the result of physical property analysis, electron microscope thin sections and field emission scanning electron microscopy.Research results showed that the mud shale was Ⅰand Ⅱbased,vitrinite reflectance was generally more than 0.8%,and hydrocarbon generation potential showed that the hydrocarbon source rocks were good.Major components of sandstone in the study area from the 7th member in Yanchang Formation were composed of clay minerals,quartz and feldspar.Physical property of sandstone results showed that the average porosity was 7.6% and the average permeability was 0.27 × 10-3 μm2 .The pore types were mainly intergranular pores, dissolution pores and microcracks.So,the high quality source rocks in Wuqi and Zhidan area were the material basis for the formation of tight oil.The physical properties and pore characteristics of the reservoirs determined the widespread distribution of tight oil.关键词
烃源岩/致密油储层/孔隙/长7段/吴起-志丹地区Key words
Source rocks/Tight oil reservoir/Pore/Chang 7 member/WuQi and ZhiDan area分类
能源科技引用本文复制引用
马文强,邓亚仁,任战利..吴起-志丹地区致密油成藏主控因素研究[J].石油化工高等学校学报,2016,29(6):66-71,6.基金项目
国家自然科学基金资助(41372128) （41372128）
西北大学大陆动力学国家重点实验室科技部专项(BJ08133-1) （BJ08133-1）
国家重大专项资助(2011ZX05005-004-007HZ). （2011ZX05005-004-007HZ）
