中国南方海相生烃成藏研究的若干新进展(二) 南方四套区域性海相烃源岩的地球化学特征   总被引：12，自引：0，他引：12  

梁狄刚  郭彤楼  陈建平  边立曾  赵喆 《海相油气地质》2009,14(1)

南方四套区域性高、过成熟海相烃源岩的地球化学特征有:(1)干酪根显微组分以Ⅱ型为主;各层系干酪根和沥青"A"的δ13C随时代变新而变重,反映了高等植物输入的增多。(2)上古生界烃源岩沥青"A"和总烃含量比过成熟的下古生界烃源岩高出6～10倍;与相同层系低成熟烃源岩比较,高、过成熟烃源岩已大量排烃。(3)下古生界烃源岩抽提物正烷烃的双峰型分布代表了两类具不同脂肪链结构的藻类输入;上古生界既有双峰型又有单峰型分布,反映了水生生物与高等植物的不同贡献。(4)Pr/Ph比和甾、萜烷常规生物标志物的分布在高、过成熟热演化阶段已经趋同和失效,难以区分不同层系烃源岩和用作油源对比。(5)三芳甾烷、甲基三芳甾烷,特别是三芳甲藻甾烷等生物标志物,可以区分不同地区、不同层系烃源岩,并可用作油源对比。  相似文献   

川东北地区异常高压形成的地温场背景   总被引：33，自引：6，他引：27       下载免费PDF全文

卢庆治  胡圣标  郭彤楼  李忠平 《地球物理学报》2005,48(5):1110-1116

利用四川东北地区现有的钻井测温数据及测定的岩石样品热导率数据,计算了12口钻井的大地热流值. 结果表明,川东北地区现今地温梯度为18～25 ℃/km,平均21 ℃/km,大地热流值介于41～57 mW/m2之间,平均为49 mW/m2. 在此基础上,利用镜质体反射率(Ro)资料对研究区热史进行了恢复,认为研究区在255Ma左右古热流达到最高值(62～70 mW/m2),此后热流持续降低直到现今;研究区中-新生界不整合面的剥蚀厚度最大,可达约2100 m;异常高压是在低热流的地温场背景下形成的.  相似文献   

四川盆地普光大型气田的发现与勘探启示   总被引：105，自引：3，他引：102  

马永生郭旭升  郭彤楼黄锐蔡勋育  李国雄 《地质论评》2005,51(4):477-480

普光气田是四川盆地近期发现的规模最大、埋藏最深、资源丰度最高的气田。在对普光气田的勘探及气藏基本特征研究的基础上,笔者总结了普光大型气田的发现与勘探启示,即成熟盆地的勘探需要有新思路;勘探技术是促进勘探发展的技术保障;大型富油气盆地油气成藏类型多,成藏条件复杂,立体勘探能有效降低勘探风险。  相似文献   

四川盆地东北部长兴组层序地层与储层分布   总被引：52，自引：4，他引：48  

马永生  牟传龙  郭彤楼  谭钦银  余谦 《地学前缘》2005,12(3):179-185

四川盆地东北部的二叠系长兴组为一套碳酸盐岩地层。宣汉盘龙洞剖面详尽研究表明,长兴组可分为两个三级层序:第1层序的海侵体系域由开阔台地滩间相沉积组成,高位体系域为台地边缘礁滩相沉积;第2层序的海侵体系域为浅滩沉积,高位体系域为暴露浅滩相-蒸发潮坪相沉积。长兴组中层序界面主要有水下间断不整合面和暴露侵蚀不整合面两类,相当于PeterVail的II类层序界面。在层序地层研究的基础上,对长兴组储层的时空分布特点进行了系统研究。研究发现,储层与层序地层关系密切,储层主要发育在层序的高水位体系域中:礁滩相储层位于第1层序的高位体系域中,而暴露浅滩-蒸发潮坪储层则主要产在第2层序的高水位体系域中。长兴组层序地层格架图以及层序高水位体系域沉积相平面图的编制,成为预测储层二维空间分布的基础。结果表明,礁滩相储层分布于通江—开县碳酸盐台地的东西两侧,暴露浅滩-蒸发潮坪储层遍布于通江—开县的碳酸盐台地及其东西两侧地区之中。两个层序高位体系域中的储层岩石孔隙丰富,储集条件较好,分布面积较广,从而成为研究区域油气勘探的重要目的层。  相似文献   

集体建设用地使用权流转的几点建议     

楼海风  潘灵芳 《浙江地质》2010,(12):33-34

集体建设用地流转是城市化和工业化发展的必然趋势,是土地作为一种特殊商品按市场价值规律进行等价交换的必然选择,也是土地作为一种生产要素按市场经济规律进行资源配置的必然结果。本文从集体建设用地流转的现状入手,阐述了集体建设用地流转的必要性,提出了开展集体建设用地流转的建议。  相似文献   

柴北缘大型基底断裂——马仙断裂的构造特征研究     

王亮  肖安成  杨树锋  巩庆霖周苏平沈中延  吴磊  楼谦谦 《地质科学》2010,45(1):157-166

利用地面地质、地球物理和钻井资料,对位于柴达木盆地北缘的马仙断裂带的平面分布和剖面结构特征进行了分析,详细的研究了该断裂的形成、发育时间和运动学特征,在此基础上,提出了一个合理的断裂活动的运动学模型。研究认为马仙断裂形成于晚白垩世,在整个新生代期间长期活动,控制了断裂两侧的盆地结构、沉积分布和油气聚集,是一条断面南倾的具有左行走滑分量的斜向冲断层。马仙断裂的运动特征源于南祁连山对盆地的差异性推覆作用。  相似文献   

砂卵石层大口径空气潜孔锤钻进与取样技术     

楼日新  李子章苏宁 《地质与勘探》2003,39(2):91-94

软基建坝必须对软基的结构、分层、物理力学性质、渗透性作全面分折研究。其中的砂卵石层取样,应力求保持样品不受扰动。常规法采用试坑、浅(竖)井取样,取样效果虽好,但受深度的限制。国外采用冻结法、化学灌浆法、钢板桩法钻取水下原状样,但耗资巨大,难以实施。研制一种新的钻进方法来提高砂卵石层取样的原状性是非常必要的。  相似文献   

Current measurements and spectral analyses in the upper 450 m and deep layers of the northeastern South China Sea   总被引：4，自引：1，他引：3  

袁耀初  赵进平  王惠群  楼如云  陈洪  王康墡 《中国科学D辑(英文版)》2002,45(11):1008-1026

On the basis of the current measurements from the moored Long Ranger ADCP in the upper 450 m layer and the deep current measurements at 2000 and 2300 m from the moored cur-rent meters with the time series data of about 7 months at the mooring station in the northeastern South China Sea, the spectral analyses and calculation have been made. The major results are as follows: (ⅰ) From the progressive vector diagrams of the observed daily currents at the water lev-els from 50 m to 400 m, its temporal variation of velocity rotated counterclockwise in most of the observing time. This agrees basically with the result from the qualitative analysis of the sea surface height data, which was obtained from TOPEX/ERS-2 altimeter data by CCAR. The daily and monthly average velocities are both the largest in November, next in October and minimum in Au-gust. (ⅱ) At the 2000 and 2300 m levels, the daily and monthly average velocities are both the largest in January, next in September and minimum in August. From the seasonal change of cur-rents, the current velocity is the strongest in winter (January-March), next in autumn, and weak in summer. (ⅲ) There exists the variation of tidal current with the change of depth. In the upper layer, the height of diurnal peak is higher than that of semidiurnal peak. However, the semidiurnal peak is higher than the diurnal peak at the levels from 200 m to 400 m. In the layers above 450 m the clockwise component is dominant in their fluctuations. In the layers below 1500 m the diurnal peak is again higher than the semidiurnal peak. (ⅳ) There is the prominent periodic fluctuation of more than two months in the layer from 50 m to 2300 m. The period of this prominent peak is 75 d and its fluctuation is counterclockwise in the upper 450 m layers, and is 68 d and 69 d at the depths of 2000 and 2300 m, respectively, and the counterclockwise component is dominant in their fluctua-tions. (ⅴ) There are the variations of periods fluctuating with the change of depth in the upper 450 m layers. For example, when f＞0, there are the prominent fluctuations of about 22 d and 15 d pe-riods at the 50 and 100 m levels. However, there are no such periods at the layer from 200 m to 400 m, where only the fluctuation of about 13 d period occurs. (ⅵ) There are the fluctuations with periods of more than one month, 23 d and 15 d at the 2000 m and 2300 m levels. (ⅶ) In the layer from 50 m to 2300 m there are the following prominent peaks: ⅰ) the fluctuation in the period range of about 4-8 d, which occurs in the weather process; ⅱ) the fluctuation with inertial period, the fluctuation is clockwise; and ⅲ) the fluctuations with short periods of about 8 h and 6 h. (ⅷ) From the cross spectral estimates between two time series, it is shown that there are significant coherence peaks with the periods of more than two months (T = 68.3 d) and more than one month between the two time series of currents at 2000 m and 2300 m depths, and also those with periods of about half a month (15.5 d), 2 d and so on between two time series of currents at 100 m and 2300 m depths.  相似文献   

普光气田深部优质白云岩储层形成机制   总被引：6，自引：0，他引：6  

马永生  郭彤楼  赵雪凤  蔡勋育 《中国科学D辑》2007,37(Z2)

普光大型气田的发现为我国深层海相碳酸盐岩的勘探提供了重要参考.普光气田发现了目前国内最好的深部白云岩储层,储层不仅厚度大,分布范围广,而且次生孔隙也异常发育.研究认为,普光气藏的油气充注时间早、埋藏深、有机质热演化程度高,烃(油气)-岩(碳酸盐岩储层)-水相互作用的时间长.该地区次生孔隙的发育受多期次成岩作用的影响,成因机理复杂.通过对普光气田长兴组-飞仙关组沉积环境、沉积相带和储层孔隙特征的研究,认为普光优质白云岩储层的形成是发育在有利沉积相带的基础上,受表生溶蚀、埋藏溶蚀、超压作用和构造运动等多种因素共同作用的结果,其中TSR对储层的埋藏溶蚀作用和有机质热演化形成的超压作用对长兴组-飞仙关组次生孔隙发育的具有重要的影响.  相似文献   

Paleoclimatic Change Inferred from Carbon Isotope Composition of Organic Matter in Sediments of Dabusu Lake, Jilin Province, China     

沈吉张恩楼  羊向东RyoMatsumoto 《中国海洋湖沼学报》2004,22(2):124-129

Study on the organic compounds and stable isotope composition of a sediment section in Dabusu Lake revealed that the organic materials in the sediments came mainly from terrestrial plants brought into the lake by rtmoff.The δ^13 C of the organic materials had high values during warm-dry climatic stages and decreased in cold-wet stages.Analysis of data on carbonate content and ^14C age showed that the lake basin had experienced several wet-cold and warm-dry climatic cycles since 15000 a BP. Since 6700 a BP, the climate reached a relatively stable warm-dry stage,so that the lake water was gradually condensed and finally a saline lake was formed.  相似文献