冷东地区下干柴沟组上段沉积储层特征研究
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摘要
综合运用重矿物、岩心、测录井及物性资料,对冷东地区浅层下干柴沟组上段沉积储层特征进行了研究。结果表明该区沉积期离物源距离较近,发育辫状河三角洲平原沉积,砂岩类型以长石岩屑砂岩和岩屑长石砂岩为主,成分和结构成熟度较低。储层孔隙类型主要为残余原生粒间孔,碎屑的粒径大小与孔渗高低呈正相关性。根据储层分类标准,将研究区储层从优至劣分为三类,大部分为Ⅱ类和Ⅲ类储层,孔隙度和渗透率较低,属于中低孔—低渗储层,且非均质性较强。研究区储层物性与沉积时的水动力强度有关,优质储层主要分布于辫状河三角洲平原分流河道较厚的砂体中。
Based on the data of the heavy mineral, core, logging and physical, we studied the sedimentary microfacie reservoirs' characteristics of the upper reservoir of the lower Gangchaigou formation in eastern Lenghu region. The results show that during the deposition period, the area is close to the source, and the developed raided river delta plain, sandstone type is mainly composed of feldspar lithic sandstone and lithic feldspar sandstone, and its composition and structure maturity are low. The main pore types of the reservoir are the residual intergranular pores, and the grain size is positively correlated with the porosity and permeability. According to the reservoir classification standard, the reservoir area is divided into three types, most of which not only belong to reservoir Ⅱ and Ⅲ with low porosity and permeability, but also belong to medium and low porosity-low permeability reservoirs with strong heterogeneity. The physical properties of reservoirs in the study area are related to the hydrodynamic forces at the time of the sedimentation. The high quality reservoirs are mainly distributed in thick sand bodies with braided river delta distributions.
Based on the data of the heavy mineral, core, logging and physical, we studied the sedimentary microfacie reservoirs' characteristics of the upper reservoir of the lower Gangchaigou formation in eastern Lenghu region. The results show that during the deposition period, the area is close to the source, and the developed raided river delta plain, sandstone type is mainly composed of feldspar lithic sandstone and lithic feldspar sandstone, and its composition and structure maturity are low. The main pore types of the reservoir are the residual intergranular pores, and the grain size is positively correlated with the porosity and permeability. According to the reservoir classification standard, the reservoir area is divided into three types, most of which not only belong to reservoir Ⅱ and Ⅲ with low porosity and permeability, but also belong to medium and low porosity-low permeability reservoirs with strong heterogeneity. The physical properties of reservoirs in the study area are related to the hydrodynamic forces at the time of the sedimentation. The high quality reservoirs are mainly distributed in thick sand bodies with braided river delta distributions.
引文
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[3]米立军,段吉利.渤中坳陷中浅层油气成藏特点及其聚集规律[J].石油学报,2001,22(2):32-37.
[4]颉永琛,关平,戴胜群,等.南八仙油气田中浅层(N1—N22)油气藏类型研究[J].天然气地球科学,2012,23(5):868-875.
[5]陈波,陈汾君,吴志雄,等.柴北缘冷湖地区古近系路乐河组成岩作用及有利成岩相研究[J].地质科技情报,2015,34(4):20-27.
[6]陈吉,张永梅,史基安,等.柴北缘冷湖—马仙地区古近系—新近系成岩作用特征[J].岩性油气藏,2012,24(2):21-25.
[7]汪正江,陈洪德,张锦泉.物源分析的研究与展望[J].沉积与特提斯地质,2000,20(4):104-110.
[8]赵红格,刘池洋.物源分析方法及研究进展[J].沉积学报,2003,21(3):409-415.
[9]付玲,关平,赵为永,等.柴达木盆地古近系路乐河组重矿物特征与物源分析[J].岩石学报,2013,29(8):2867-2875.
[10]和钟铧,刘招君,张峰.重矿物在盆地分析中的应用研究进展[J].地质科技情报,2001,20(4):29-32.
[11]李珍,焦养泉,刘春华,等.黄骅坳陷高柳地区重矿物物源分析[J].石油勘探与开发,1998,25(6):5-7.
[12]李双建,王清晨,李忠.库车坳陷库车河剖面重矿物分布特征及其地质意义[J].岩石矿物学杂志,2005,24(1):53-61.
[13]张金亮.高邮凹陷阜三段沉积相分析[J].中国海洋大学学报自然科学版,2002,32(4):591-596.
[14]张占松,张超谟.测井资料沉积相分析在砂砾岩体中的应用[J].石油天然气学报,2007,29(4):91-93.
[15]李红哲,杨占龙,吴青鹏,等.沉积相分析在岩性油气藏勘探中的应用——以吐哈盆地胜北洼陷中侏罗统-白垩系为例[J].天然气地球科学,2006,17(5):698-702.
[16]陈波,王子天,康莉,等.准噶尔盆地玛北地区三叠系百口泉组储层成岩作用及孔隙演化[J].吉林大学学报(地球科学版),2016,46(1):23-25
[17]应凤祥,王衍奇,王克玉,等.中国油气储层研究图集,卷一:碎屑岩[M].北京:石油工业出版社,1994.