准噶尔盆地西泉地区梧桐沟组低电阻率油层识别及分布
摘要
准噶尔盆地东部西泉地区上二叠统梧桐沟组储集层电阻率低,西泉以外的其他地区对应储集层都为中、高电阻,它们具有显著差别。西泉地区低电阻油层的电性表现为低电阻率、低密度、低自然伽马"三低"的特征。据岩心取样化验分析,低电阻油层的岩性为含大量塑性泥屑的中细粒岩屑杂砂岩,钙质夹层发育,为中孔、低渗储集层。泥质含量高及含水饱和度高是形成油层电阻率低的直接原因。通过测井解释识别储集层岩性,经过地震解释论证,目的层油藏是在低位和湖侵体系域沉积期间所形成的岩性圈闭中聚集而成,这种岩性油藏的规模和分布受控于岩性圈闭的发育,该区岩性圈闭的形成主要受控于沉积环境,这是导致产油储集层电性"三低"的本质因素。类比研究表明,该区同类岩性圈闭分布广泛、面积大,十分有利于岩性油藏的形成。
Low-resistivity reservoir of Wutonggou formation of the Upper Permian in Xiquan area in eastern Junggar basin is found rather than other areas with middle-high resistivity beyond Xiquan.The reservoir in Xiquan area is characterized by "three lows",namely,low resistivity,low density and low gamma ray.And the lithology of low-resistivity reservoir is medium-fine lithic greywacke with lots of plastic pelolithic texture and calcareous interbeds,belonging to medium porosity and low permeability reservoir,according to the rock samples analysis.The direct reasons for forming low resistivity are high shale content and high water saturation.Through log interpretation for identification of the lithology of reservoir,integrated with seismic interpretation result,the target reservoir's oil is accumulated in the lithologic trap formed during low and lake transgressive system tracts deposition.The scale and distribution of the lithologic reservoir are controlled by the development of lithologic traps.Meanwhile,the formation of lithologic traps is controlled by the depositional setting.These are essential factors for forming the "three lows" in Xiquan area.Exploration survey shows that similar traps in this area are developed widely,which is favorable for shaping lithologic hydrocarbon reservoirs.
Low-resistivity reservoir of Wutonggou formation of the Upper Permian in Xiquan area in eastern Junggar basin is found rather than other areas with middle-high resistivity beyond Xiquan.The reservoir in Xiquan area is characterized by "three lows",namely,low resistivity,low density and low gamma ray.And the lithology of low-resistivity reservoir is medium-fine lithic greywacke with lots of plastic pelolithic texture and calcareous interbeds,belonging to medium porosity and low permeability reservoir,according to the rock samples analysis.The direct reasons for forming low resistivity are high shale content and high water saturation.Through log interpretation for identification of the lithology of reservoir,integrated with seismic interpretation result,the target reservoir's oil is accumulated in the lithologic trap formed during low and lake transgressive system tracts deposition.The scale and distribution of the lithologic reservoir are controlled by the development of lithologic traps.Meanwhile,the formation of lithologic traps is controlled by the depositional setting.These are essential factors for forming the "three lows" in Xiquan area.Exploration survey shows that similar traps in this area are developed widely,which is favorable for shaping lithologic hydrocarbon reservoirs.
引文
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[2]刁刚田,杨元亮,宋文芳.低电阻率油层测井识别技术[J.]特种油气藏,2003,10(2):53-55.
[3]廖明光,苏崇华,唐洪,等.砂泥岩薄互层低阻油层地质成因[J.]新疆石油地质,2010,30(2):154-157.
[4]张丽霞,朱国华,李民.准噶尔盆地白垩系低电阻油层成因[J.]新疆石油地质,2004,25(4):385-387.
[5]Hamada G M,Al-Blehed M S,Al-Awad M N,et al.Petrophysical evaluation of low-resistivity sandstone reservoirswith nuclear magnetic resonance log[J.]Journal of PetroleumScience and Engineering,2001,29:129-138.
[6]杨永林.东濮凹陷低阻油层的形成机制及其勘探[J.]石油天然气学报(江汉石油学院学报),2005,27(3)4:37-438.
[7]赵政璋,周灿灿,刘国强,等.低阻油气藏测井识别评价方法与技术[M.]石油工业出版社,2006,7:1,64-71.
[8]田中元,卞德智,陈昊,等.改进的pichett法在Y油田低阻油层识别中的应用[J.]石油学报,2006,7:1,64-71.
[9]赵虹,党牛牛牺,姚泾利,等.鄂尔多斯盆地姬塬地区延长组长2低阻油层成因机理[J.]石油实验地质2,009,31(6):588-592.
[10]丁次乾.矿场地球物理[M.]山东东营:中国石油大学出版社,2008:178-188.
[11]李召成,吴金龙,于代国,等.曲堤油田低阻油层形成机理及曲线形态识别方法[J.]大庆石油地质与开发,2006,25(6):102-104.
[12]尹旭,彭士宓,陈建文,等.低阻油层差别技术在吉林油区的应用[J].大庆石油地质与开发,2008,27(1):126-129.
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