十屋油田营城组-沙河子组储层物性特征及控制因素分析

在沉积相研究基础上,利用岩芯物性分析数据,系统论述了十屋油田营城组—沙河子组储层物性特征及影响储层物性的主要地质因素。认为该油田营城组—沙河子组储层为低孔-特低孔、特低-超低渗储层,储层物性主要受沉积作用和成岩作用因素控制。其中压实作用、胶结作用造成储层物性变差,而溶蚀作用改善储层物性。

松辽盆地梨树断陷白垩系营城组—沙河子组超压特征及其对成岩作用的影响

根据钻杆测试压力(DST)、油气测试、测井等资料,结合岩石矿物及有机地球化学分析数据,研究松辽盆地梨树断陷营城组—沙河子组现今压力场分布特征,开展超压预测和成因分析,探讨超压对成岩作用的影响。结果表明:营城组—沙河子组的超压主要分布在深度2.50 km以下,超压压力因数在1.06~1.48之间,推测超过1.80。欠压实作用、生烃作用及二者在不同地区的叠加是盆地超压形成的主要原因,但生烃作用对盆地大规模超压形成的贡献要大于欠压实作用的;超压平面分布主要受盆地的沉降中心、优质烃源岩分布控制,纵向上,营城组—沙河子组超压系统存在分隔。超压发育能够抑制压实、黏土矿物的转化,对碳酸盐胶结作用的影响在不同超压环境中存在差异,延缓有机酸的生成而导致溶蚀作用在深度上的下移,在不同增孔和减孔成岩作用的综合影响下控制深部优质储层形成。该结果可为研究区营城组—沙河子组勘探开发提供参考。

新疆的南华系及我国南华系的几个地质问题——纪念恩师王曰伦先生诞辰一百周年

新疆的南华系广泛发育在库鲁克塔格、柯坪、西天山及塔里木西南部地区,以库鲁克塔格地区层序最为完整。本文作者对该区晚元古界的冰期划分提出了新的认识,认为该区新元古界共有四次冰川活动(共可划分为4个冰期和3个间冰期)。其中南华系有三次冰川活动(三个冰期和两个间冰期)的沉积,自下而上为贝义西冰期(第一冰期)、照壁山间冰期(第一间冰期)、阿勒通沟冰期(第二冰期)、"黄羊沟间冰期(第二间冰期)"和特瑞爱肯冰期(第三冰期);另外属于震旦纪的还有,扎摩克提组、育肯沟组、水泉组(第三间冰期),汉格尔乔克冰期(第四冰期)。作者认为我国南华系的时限应大体为680～850Ma。在我国北方亦有南华纪的地层存在,如辽东的桥头组、长岭子组、营城子组等及山东东部的辅子夼组、马山组等,但迄今尚未发现有可靠的冰成岩的报道。华北地区的罗圈组、正目观组、红铁沟组的冰碛层均属于震旦纪末罗圈冰期的冰川活动,与汉格尔乔克冰期相当,并不相当于华南南华纪晚期的南沱冰期。

梨树断陷七棵树地区层序地层与隐蔽油气藏

运用层序地层学理论分析了梨树断陷七棵树地区层序地层学特征。将七棵树地区沙河子组-营城组划分为3个三级层序和6个体系域,建立了层序地层格架。七棵树地区隐蔽油气藏成藏要素与层序地层格架有着密切的关系,湖侵体系域至高位体系域的转换时期是优质烃源岩发育的时期,湖侵体系域的早期和高位体系域的晚期是砂体发育的时期,三级层序界面与层序界面附近的砂体是油气运移的良好通道,与长期活动的断层一起构成了七棵树地区复杂的油气运移输导体系。七棵树地区发育砂岩透镜体油气藏和砂岩上倾尖灭油气藏2种隐蔽油气藏类型,不同类型的隐蔽油气藏在层序格架中出现的位置是可以预测的。其中砂岩透镜体油气藏主要发育在各层序旋回的中部,砂岩上倾尖灭油气藏多分布在基准面上升半旋回和基准面下降半旋回的中部。以SW11井区油藏为例,简要分析了层序地层学在隐蔽油气藏勘探中的应用。

大连地区水泥矿山资源开发利用现状及建议

1大连地区水泥矿山资源现状 大连地区水泥用石灰石资源相对比较丰富，主要分布在大连市旅顺口区、甘井子区、金州新区、瓦房店复州湾镇、瓦房店长兴等区域，含矿层位由老至新分别为：辽河群大石桥组，震旦系南关岭组、甘井子组、营城子组，寒武系下统馒头组、中统张夏组，奥陶系中统马家沟组等，这些层位都形成了不同规模的矿床。其中以震旦系营城子组含矿层位最为重要，形成多处大型矿床，矿石质量好，可生产高标号水泥；其次是寒武系中统张夏组和奥陶系中统马家沟组，已形成多处中型矿床，

Architecture of volcanic sequence and its structural control of Yingcheng Formation in Songliao Basin

Yingcheng Formation is a set of volcanic strata composed of lava rocks,volcanic clastic rocks and sedimentary rocks,filled in some fault depressions in Songliao Basin,early Cretaceous.The study about litho-facies succession of Yingcheng Formation in the outcropped area of the southeast margin and in Xujiaweizi fault depression and its distribution based on analysis of seismic data,shows that the sequence of volcanic strata is quite different from the clastic sedimentary sequence.To study the architecture of volcanic sequence and its structural control of Yingcheng Formation in Songliao Basin,in this work,dividing of the volcanic sequence and dating of the sequence boundaries were finished firstly,then displacement and displacement rate of faults were calculated.The results show that,sample ages of top of the first member,the seconde member,and the third member are 127 Ma,115 Ma,110.7 Ma,respectively and sample age of the bottom of the third member is 114.7 Ma.The maximum displacement and displacement rate of the fault 1 are 3 km and 300 m/Ma,respectively,and those of the fault 2 are 3 km and 1000 m/Ma.Studies suggest that,the cooling unit of lava rock or pyroclastic rock is a basic genetic stratigraphic unit in volcanic sequence stratigraphy.Cooling units can construct a parasequence reflecting a volcanic eruption stage.A sequence was superimposed by some parasequences,responding to a volcanic active cycle.There are three types of volcanic sequences in Yingcheng Formation: type of explosion,type of effusion and type of mixed explosion-effusion.The surface of the volcanic sequence,an unconformity surface widely spread and traced in seismic profiles,is a base for analysis of volcanic sequence.The development of volcanic sequence was controlled by faulting,and the curves of fault displacement(rate)can reflect this control.The preservation of volcanic sequence was controlled by the type of volcanic structure and the regional subsidence,also different from that of the sedimentary.The type of volcanic structure of Xujiaweizi was a volcanic depression during the forming of Yingcheng Formation,and the breakdowns of volcanoes and structural subsidence were key factors in the volcanic sequences preservation.

Diagenesis characteristics and their influence on porosity and permeability of sandstone from Yingcheng Formation in Jinshan field

In order to understand the diagenesis and its influence on porosity and permeability of sandstones from Yingcheng Formation in Jinshan field,applying thin sections,casting and scanning electron microscope,the authors studied petrography,diagenesis,porosity and permeability of Yingcheng Formation sandstone reservoir. The results show that the reservoir of Yingcheng Formation is mainly composed of lithic arkoses. Sandstones experienced compaction,pressolution,cementation,metasomatism and dissolution. The primary pores of the sandstones are undeveloped; most of pores are the secondary pores,which are mainly intragranular dissolution pores in feldspar and debris. The compaction and cementation reduced the primary pores in sandstones,the porosity and permeability decreased; while the dissolution formed the secondary pores,resulting in the porosity and permeability increase. Due to compaction and cementation,the porosity and permeability are reduced with increasing of depth. There exists an abnormal enlargement of porosity and permeability within a depth range 2310--2450 m. In combination with analysis of petrology,the dissolution of feldspar and debris is most developed in the depth range. Therefore,compaction,cementation and dissolution are the important factors which affect the porosity and permeability of sandstones.