摘要
中拐凸起二叠系上乌尔禾组是继三叠系百口泉组之后发现的一个大型连续型砂砾岩油气藏群,但其北部区域油气成藏特征研究较少且成藏模式认识不清。笔者通过岩心观察、铸体薄片、测井和录井分析等资料,结合区域构造背景与沉积环境,对中拐凸起北部K82井区油气成藏特征进行综合分析,得出以下结论:K82井区主要发育扇三角洲平原和滨浅湖沉积亚相,大面积的分流河道砂砾岩、河道间及滨浅湖细砾沉积物构成良好的储盖组合,物性显示研究区上乌尔禾组为中-低孔低渗砂砾岩储层;以二叠系风城组为主的多套烃源岩为上乌尔禾组油气藏提供充足的油源供给;形成于华力西—燕山期的断裂和上下地层不整合面成为研究区上乌尔禾组油气疏导体系,油藏为下生上储断层-岩性型成藏模式。该结论为克拉玛依油田上乌尔禾组油气进一步勘探开发提供科学依据。
The permian system upper Wuerhe formation of Zhongguai bulge is a large continuous conglomerate oil and gas reservoir group found after the triassic system Baikouquan formation.,there are few studies on hydrocarbon accumulation characteristics in the northern part of the region,and the understanding of hydrocarbon accumulation patterns is unclear.Based on the data of core observation,cast thin section,well logging and log analysis,combined with the regional structural background and sedimentary environment,the characteristics of hydrocarbon accumulation in well block K82 north of Zhongguai bulge are comprehensively analyzed.Those studies have drawn the following conclusions:The well block K82 mainly develops fan-delta plain and shallow lakeside sedimentary subphase,with large area of divergent river channel sand and conglomerate,inter-channel and shallow lakeside fine gravel sediments forming a good reservoir-cover combination,the physical properties shown that the upper Wuerhe formation in the study area is a medium-low-hole and low-permeability conglomerate reservoir;Multiple sets of hydrocarbon source rocks,mainly from the permian Fengcheng formation,provide sufficient oil supply for the upper Wuerhe formation reservoir;Fractures and upper and lower stratigraphic unconformities formed in the Hercynian-Yanshanian period have become the oil and gas transportation system of the upper Wuerhe formation in the study area,and the oil reservoir is the source rock below,reservoir above and fault-lithology-type reservoir formation patterns.The conclusion provides scientific basis for further exploration and development of oil and gas in the upper Wuerhe formation of the Karamay oilfield.
作者
张新远
李永军
刘凯
王锋
彭南赫
付浩
ZHANG Xinyuan;LI Yongjun;LIU Kai;WANG Feng;PENG Nanhe;FU Hao(School of Earth Science and Resources,Chang’an University,Xi’an 710054,Shaanxi,China;Exploration and Development Institute,Xinjiang Oilfield Company,Petro China,Karamay 834000,Xinjiang,China)
出处
《西北地质》
CAS
CSCD
北大核心
2024年第2期14-23,共10页
Northwestern Geology
基金
新疆油田公司2022~2023年油气勘探科技外协项目“玛南上乌尔禾组储层岩矿特征研究”(20221020)。
关键词
成藏特征
储集层
上乌尔禾组
K82井区
准噶尔盆地
hydrocarbon accumulation characteristics
reservoir
upper Wuerhe formation
K82 well block
Junggar basin
