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1.
多旋回沉积盆地地温场与烃源岩演化--以苏北盆地为例   总被引:7,自引:0,他引:7  
目的 恢复苏北盆地古地温场,进行热演化史研究,确定主要的生烃时期。方法 在盆地演化史分析的基础上,应用镜质体反射率、包裹体分析等技术。结果 苏北盆地新生代具有多旋回盆地演化的特点,地温梯度呈降低趋势,古近纪40~45℃/km,新近纪30℃/km左右;烃源岩演化经历了早期生烃、中期生烃停滞、晚期生烃3个阶段。结论 烃源岩成熟度主要受古地温场的控制,而与现今地温梯度无关;渐新世持续18Ma的三垛抬升运动是造成苏北盆地烃源岩演化程度低的主要原因。  相似文献   

2.
鄂尔多斯盆地富县地区中生界热演化史探讨   总被引:5,自引:0,他引:5  
目的对富县地区中生界热演化史进行探讨,为该区油气勘探及资源评价提供依据。方法统计测温资料和地化资料,采用古地温恢复法、声波时差剥蚀厚度法及盆地模拟法,恢复最大古地温梯度、烃源岩热演化史及生烃史。结果该区三叠纪进入快速沉降阶段,早侏罗世—早白垩世进入缓慢沉降阶段,早白垩世晚期以来进入后期抬升阶段,剥蚀厚度1 100~1 200 m。结论富县地区长7段烃源岩在中侏罗世174 Ma,进入低成熟阶段;早白垩世136 Ma,进入成熟阶段;早白垩世晚期96 Ma,埋深达到最大,Ro=0.85%,地温梯度为4.8℃/100 m;早白垩世晚期96 Ma以来,生烃作用减弱。富县地区长7烃源岩主生烃期为早白垩世。  相似文献   

3.
山东济阳坳陷盆地是受太平洋板块构造俯冲运动的影响,形成于古近系的古新世-始新世(Ek—Es).本文通过对济阳坳陷盆地中Esd—Ek地层自生伊/蒙混层矿物的研究,探讨了其经历的古地温和古地温梯度,在此基础上,对Es4-Ek地层的剥蚀深度进行了估算.研究发现,东营凹陷郝科l井处自生伊/蒙混层矿物反映的Es4~Ek古地温梯度为3.90℃/100m,剥蚀厚度为360m左右;惠民凹陷盘深3井中Ek古地温梯度为3.92℃/100m,剥蚀厚度为135m左右;沾化凹陷桩深1井中Es4~Ek古地温梯度为3.82℃/100m,而该处Es4-Ek地层基本没有剥蚀.但从沾化凹陷中自生伊/蒙混层矿物的分布特征看,在义170井处的Es4地层剥蚀厚度达390m,可见沾化凹陷中Es4-Ek地层剥蚀厚度变化较大.另外,济阳坳陷盆地的古地温梯度普遍高于现今地温梯度,该盆地自形成以来一直处于降温状态.研究结果说明利用伊/蒙混层矿物特征来探讨古地温,获取古地温梯度,并恢复剥蚀厚度是一个比较有效的方法.  相似文献   

4.
四川盆地古地温梯度和中-新生代构造热历史   总被引:5,自引:0,他引:5  
根据27口井的镜质体反射率剖面,恢复了四川盆地早白垩世末—古新世时的古地温梯度.结果表明,古地温梯度介于20~25℃.km-1,总体呈南部略大于北部、东部大于西部的分布特征.根据古今地温梯度的对比,川西坳陷新生代早期以来地温梯度没有明显的变化,川东和川东北地区晚中生代以来地温梯度下降,而川中和川南地区晚中生代以来地温梯度升高.结合构造演化背景分析,盆地中新生代热历史主要受二叠纪末期的构造热事件、中生代晚期以来岩石圈厚度演化以及现今活动构造的影响.其中,二叠纪末期的构造热事件波及盆地大部分地区;现今活动构造对川南地区有明显的影响;中生代晚期以来的岩石圈厚度演化,可能是控制中新生代盆地大部分地区热历史的主要因素.  相似文献   

5.
塔里木盆地塔中地区地质热历史研究   总被引:5,自引:0,他引:5  
为了解塔里木盆地以及塔中地区构造演化史 ,对塔中地区古地温梯度的变化趋势进行了研究 ,利用磷灰石裂变径迹与镜质体反射率反演计算了塔中地区 3口井的地质热历史 .结合前人研究成果 ,认为塔中地区自古生代以来古地温总体呈下降趋势 ,其间存在两个相对较高的古地温期 ,一个是寒武纪—早奥陶世 ,另一个是二叠纪 ;早古生代塔中地区古地温梯度较高 ,寒武纪—早奥陶世地温梯度为 3 .2~ 3 .5℃ / 1 0 0m ,此后地温梯度显著下降 ;石炭纪古地温略有上升 ,二叠纪时地温梯度可能达到 3℃ / 1 0 0m ;中生代古地温梯度平缓下降 ,中生代末地温梯度 2 5℃ / 1 0 0m左右 ;新生代地温梯度变化不大 ,现今地温梯度 2 2℃ / 1 0 0m左右  相似文献   

6.
丁集煤矿深部地温预测   总被引:1,自引:0,他引:1  
针对丁集煤矿矿井高温热害严重的问题,采用井下炮眼温度测定方法,测量地温;借助有限元ANSYS的热耦合分析程序,模拟岩巷和煤巷调热圈,修正矿井地温,确定地温梯度.预测该矿深部地温。结果表明,该矿-500m水平以上、以下的地温梯度分别为3.5、4.0℃/hm;采煤层深度为一600m以下的地温在38℃以上,属于二级热害区。该研究可为矿井深部降温提供数据参考。  相似文献   

7.
伊宁凹陷古地温恢复与热演化史研究   总被引:2,自引:0,他引:2  
应用包裹体测温和Easy-R.方法恢复了伊宁凹陷的古地温演化史,结果表明伊宁凹陷晚二叠世的地温梯度约为40℃/km,以后经过两次波动(分别对应于K1和E1两次构造运动)逐渐减小到现今的24℃/km.上二叠统烃源岩热演化程度主要受古地温控制,主生油期在中晚三叠世.印支期及其以前形成的圈闭,是二叠系油气聚集的主要场所.  相似文献   

8.
鄂尔多斯盆地延长探区下古生界热演化史   总被引:1,自引:0,他引:1  
通过钻井和试气资料,统计了延长探区马家沟组现今地层温度.应用地化资料,对马家沟组烃源岩热演化程度进行了评价;应用多种古地温研究方法恢复该区最大古地温梯度;采用将今论古方法探讨了该区各个时期的古地温梯度.在剥蚀厚度恢复的基础上,详细配置各个地层的岩性、物性、地化参数等指标,恢复了该区埋藏沉降史和热演化史.沉降史模拟表明晚三叠世(217~207Ma)为该区沉降的主要发育时期.热演化史模拟表明:延长探区马家沟组烃源岩在晚三叠世末期进入成熟阶段,晚侏罗世进入高成熟阶段,早白垩世达到过成熟干气阶段.下古生界烃源岩主生烃期为晚侏罗—早白垩世.  相似文献   

9.
矿井热害是目前淮南煤田煤矿地质工作的主要研究内容之一。文中在汇总和分析井田内32个地面钻孔井温测井数据和2个井下巷道岩温测试数据的基础上,绘制了地温-深度关系图、地温梯度-深度关系图以及井田现今地温梯度分布图,并探讨了该区现今地温场特征及其影响因素。研究表明:朱集井田现今地温梯度介于1.7~3.8℃/hm,平均2.83℃/hm,地温整体较高,在垂向上表现为传导型增温特点,在平面上表现为南高北低、东高西低的特点;地质构造对区内现今地温场起着主要控制作用,岩性特征和地下水活动对地温场的分布也有一定的影响。  相似文献   

10.
目的 恢复三塘湖盆地条湖凹陷和马朗凹陷自二叠纪以来的沉降史。方法 利用回剥技术,根据压实校正模型和艾利均衡模型对两凹陷的总沉降量及构造沉降量进行求取。结果 马朗凹陷主要经历了2个隆起期和3个沉降期,条湖凹陷为3个隆起期和4个沉降期;早、中二叠世两凹陷的沉降幅度很大,沉积速率最大可达133.46m/Ma;晚白垩世的隆起幅度最大,地层剥蚀厚度可达846m。结论 晚二叠-早侏罗世,盆地的沉降中心位于条湖凹陷,从中侏罗世西山窑期开始盆地的沉降中心向东迁至马朗凹陷内。  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

14.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

15.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

16.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

17.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  相似文献   

18.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

19.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

20.
1 Rise of studies on climate change's effects on biodiversity
Until the 1980s, climate change and biodiversity were studied as two independent disciplines for more than a century. In 1992, the Ecological Society of America's annual report named climate change, biodiversity, and the sustainable ecological system as the three major global environmental issues of the twenty-first century [1].  相似文献   

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