苏北盆地洋心次凹泰二段细粒沉积新认识
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摘要
以传统石油地质学、沉积岩石学及致密油气形成新理论、新方法为指导,在上百米岩心、薄片、X衍射及测录井资料分析基础上,开展了苏北盆地白驹凹陷洋心次凹泰二段致密油气沉积学特征研究。研究表明,泰二段细粒沉积岩既发育优质烃源岩,又发育白云岩类储集层;泥质白云岩孔隙度一般为4%~8%,为相对优质储集层;厚度一般大于12m,平面呈环状分布,源储匹配好,微观含油性较高。这些结论打破了以往关于泰二段主要发育烃源岩而储集层不发育的认识,增强了在细粒沉积区寻找致密油气的信心,为该区致密油气勘探突破提供了地质认识支撑。
Guided by the new theory and new method of traditional petroleum geology,sedimentary petrology and dense oil and gas formation,based on the analysis of hundreds of meters of core,thin film,X-diffraction and logging data,sediment characteristics of dense oil and gas of Tai-2 sandstone reservior in Yangxin subsag of Subei basin.The results showed that the fine-grained sedimentary rocks of Tai-2 sandstone reservior develope both highquality source rocks and dolomite reservoirs,and the porosity of dolostones is 4%~8%,which is relatively highquality reservoirs.The thickness is generally greater than 12 m,the plane is ring-shaped distribution,the source storage match is good,micro-oily high.These conclusions have broken the previous understanding of the main development of the source rocks of Tai-2 sandstone reservior,and have enhanced the confidence in finding the dense oil and gas in the fine sedimentation area,which provided the geological understanding support for the breakthrough oil and gas exploration breakthrough.
Guided by the new theory and new method of traditional petroleum geology,sedimentary petrology and dense oil and gas formation,based on the analysis of hundreds of meters of core,thin film,X-diffraction and logging data,sediment characteristics of dense oil and gas of Tai-2 sandstone reservior in Yangxin subsag of Subei basin.The results showed that the fine-grained sedimentary rocks of Tai-2 sandstone reservior develope both highquality source rocks and dolomite reservoirs,and the porosity of dolostones is 4%~8%,which is relatively highquality reservoirs.The thickness is generally greater than 12 m,the plane is ring-shaped distribution,the source storage match is good,micro-oily high.These conclusions have broken the previous understanding of the main development of the source rocks of Tai-2 sandstone reservior,and have enhanced the confidence in finding the dense oil and gas in the fine sedimentation area,which provided the geological understanding support for the breakthrough oil and gas exploration breakthrough.
引文
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[2]姜在兴,梁超,吴靖,等.含油气细粒沉积岩研究的几个问题[J].石油学报,2013,34(6):1031-1039.
[3]MACQUAKER J H S,ADAMS A E.Maximizing Information From Fine-grained Sedimentary Rocks:An Inclusive Nomenclature for Mudstones[J].Journal of Sedimentary Research,2003,73(3):735-744.
[4]APLIN C A,MACQUAKER H S I.Mudstone Diversity:Origin and Implications for Source,Seal,and Reservoir Properties in Petroleum Systems[J].AAPG Bulletin,2011,95(12):2031-2059.
[5]OTTER E P,MAYNARD J B,DEPETRIS J P.Mud and Mudstones:Introduction and Overview[M].Berlin:Springer,2005:223-245.
[6]赵政璋,杜金虎.致密油气[M].北京:石油工业出版社,2012:156-163.
[7]贾承造,邹才能,李建忠,等.中国致密油评价标准、主要类型、基本特征及资源前景[J].石油学报,2012,33(3):343-350.
[8]蒲秀刚,韩文中,周立宏,等.黄骅坳陷沧东凹陷孔二段高位域细粒相区岩性特征及地质意义[J].中国石油勘探,2015,20(5):30-40.
[9]鄢继华,蒲秀刚,周立宏,等.基于X射线衍射数据的细粒沉积岩岩石定名方法与应用[J].中国石油勘探,2015,20(1):48-54.
[10]陈安定.苏北盆地构造特征及箕状断陷形成机理[J].石油与天然气地质,2010,31(2):140-150.
[11]魏祥峰,张廷山,魏祥华,等.苏北盆地白驹凹陷古近系层序地层及生储盖组合分析[J].天然气地质学,2011,22(4):674-683.
[12]郝军,苏雪波,鲁改欣,等.苏北盆地白驹凹陷洋心次凹泰一段孔隙演化特征分析[J].中国地质,2011,38(4):1094-1101.