伸展构造拉张量计算方法的适用性分析及在琼东南盆地的应用     

张迎朝  汪伟  甘军  尹宏伟  朱继田  张佳星  熊小峰  贾东  郭明刚 《高校地质学报》2019,25(5):730

文章将三种以面积平衡为原理的几何学方法应用在物理模拟拉张实验中,对比三种方法的结果与模型设计参数间的 误差,讨论了三种方法的优缺点和适用范围。其中层长守恒方法需要假设在构造变形过程中层长保持不变,通过曲线拉直 可以恢复构造各阶段拉张量和拉张总量。利用面积守恒可以计算拉张构造中滑脱层深度,面积深度法允许构造变形过程中 层长和层厚的变化,多个构造前沉积地层的面积深度拟合直线可以反映构造整体拉张量和滑脱层深度。面积守恒法在已知 构造滑脱层位置的基础上,通过同构造沉积地层可以计算出拉张活动不同阶段拉张量变化和拉张总量。结合琼东南长昌凹 陷剖面特征,面积守恒法是计算其拉张量变化最准确又有效的方法,面积守恒法应用结果确定过长昌凹陷剖面在岭头组、 崖城组和陵水组沉积阶段的拉张量分别为13.8 km、15 km和21.4 km,拉张总量为50.2 km,拉张率为42.7%。三种方法在物 理模拟实验和琼东南盆地中的应用结果表明,在伸张构造中由于剪切变形作用,基于面积守恒的方法优于层长守恒的方 法。面积深度法利用构造前沉积地层的几何形态来预测构造整体拉张量和滑脱层深度,面积守恒法可以利用同构造沉积地 层和已知的滑脱层位置来预测拉张构造整体的拉张量和不同阶段的拉张量变化。  相似文献   

北黄海盆地东部坳陷勘探突破对我国近海残留“黑色侏罗系”油气勘探的启示     

肖国林  蔡来星  郭兴伟  董贺平  庞玉茂 《吉林大学学报(地球科学版)》2019,49(1):115-130

最新的勘探和研究证实,北黄海盆地东部坳陷发育了中、上侏罗统2套有效烃源岩并以上侏罗统为主力烃源岩层,在其供烃范围内形成了上侏罗统-下白垩统"下生上储式"和中-上侏罗统"自生自储式"2类成藏组合,取得了我国东部海域以侏罗系为唯一源岩的含油气盆地勘探突破。为进一步探索我国近海盆地残留"黑色侏罗系"的资源潜力和勘探前景,本文采用地震-地质综合解释、烃源岩地球化学分析、盆地模拟等方法,综合分析了我国近海主要盆地残留"黑色侏罗系"的分布和地球化学特征。结果表明,我国近海残留侏罗系暗色泥岩烃源岩非均质性较强,多属"中等"级别,局部发育"中等-好"、"中等-差"级别烃源岩,侏罗系烃源岩大多存在早（J₃-K₁）、晚（E₂末-N₁）2期生、排烃高峰,生烃总量达1.4×10¹¹ t,资源前景乐观,预测可形成侏罗系"自生自储式"和侏罗系-白垩系（或新生界）"下生上储式"2类源储组合。  相似文献   

琼东南盆地华光凹陷天然气水合物稳定带厚度的影响因素     

刘杰  杨睿  邬黛黛  金光荣  张辉 《海洋学报》2019,41(8):13-25

为了探讨琼东南盆地华光凹陷海底天然气水合物稳定带的分布规律，定量研究了静水压力、底水温度、地温梯度和气源组分对水合物稳定带的影响程度。在此基础上，分析了华光凹陷现今甲烷水合物稳定带的厚度分布。最后，综合各因素的历史演化过程，初步探讨了华光凹陷1.05 Ma BP以来天然气水合物稳定带的演化。结果表明:(1)气源组分和海底温度的变化对研究区内水合物稳定带的影响较大；水合物稳定带厚度与海底温度呈良好的线性负相关性。(2)水深超过600 m的海域具备形成天然气水合物的温压条件；超过600 m水深的海域水合物稳定带厚度大部分超过 100 m，其中西北部稳定带的最大厚度超过300 m，是有利的水合物勘探区。(3)华光凹陷1.05 Ma BP以来天然气水合物稳定带厚度经历了快速增厚–窄幅变化–快速减薄和恢复的过程。麻坑群与水合物稳定变化敏感区在空间上具有较好的叠合关系。结合前人的研究成果，推测其形成与天然气水合物的分解释放有关。  相似文献   

涠西南凹陷流沙港组烃源岩生产力及发育模式     

叶加仁  赵牛斌  杨宝林  徐建永 《地质科技通报》2020,39(1):105-113

涠西南凹陷是中国近海北部湾盆地已证实的富烃凹陷,始新统流沙港组是该凹陷主要烃源岩层系.为深入认识涠西南凹陷流沙港组烃源岩的生产力和发育特征,采用有机地球化学与地球生物学相结合、定性分析与定量计算相结合的方法正演恢复了涠西南凹陷不同次洼流沙港组不同层段烃源岩的古生产力、有机质埋藏效率和有机碳埋藏生产力,进而建立了研究区流沙港组烃源岩形成的地球生物学模式.结果表明,涠西南凹陷流沙港组烃源岩的古生产力、有机质埋藏效率及有机碳埋藏生产力在横向不同次洼和纵向不同层段上均存在差异,横向上以B次洼最优,纵向上以流二段最高;涠西南凹陷流沙港组烃源岩发育超营养湖高埋藏效率高埋藏生产力、富营养湖中等埋藏效率中等埋藏生产力及富营养湖低埋藏效率低埋藏生产力3种代表性的地球生物学模式.  相似文献   

珠江口盆地的沉积充填与珠江的形成演变   总被引：13，自引：2，他引：11  

邵磊  庞雄  乔培军  陈长民  李前裕  苗卫良 《沉积学报》2008,26(2):179-158

沉积物元素地球化学分析表明,南海北部地区沉积物渐新统与中新统明显不同,两者之间存在物源突变事件。这一沉积地质事件在时间上与南海扩张轴发生跳跃、滇西高原以及东喜马拉雅构造结的快速隆升等一系列地质构造事件十分吻合,是珠江以及珠江口盆地搬运—沉积—充填演化史上一次重大的转变。Ca/Si、CIA以及Al₂O₃等参数变化显示,珠江侵蚀区极有可能由渐新世近源硅酸盐为主的华南沿海地区拓展为中新世远达青藏高原东麓的云贵高原碳酸盐为主的地区,流域范围突然扩大。同时伴随沉积物供给增大,造成珠江口盆地从渐新世富砂为主的沉积堆积体系转变为中新世以来以泥为主的沉积堆积体系,显示出珠江的发育演化以及中新世以来的青藏高原隆升在南海北部的沉积充填演变中扮演了重要角色,对南海北部地区油气藏的形成影响深远。  相似文献   

南堡凹陷东营组层序地层格架与沉积体系   总被引：4，自引：1，他引：3  

管红  朱筱敏 《沉积学报》2008,26(5):730-736

通过对地震、岩心、钻、测井资料综合分析,将东营组划分为1个二级层序、3个三级层序。并根据初次湖泛面和最大湖泛面特征将每个层序进一步划分为低位域、湖侵域和高位域等三个体系域。层序格架和展布受凹陷结构和断裂活动影响,高柳断层以北地区东营组沉积厚度薄,且后期剥蚀严重。南部滩海地区的各层序完整,厚度相对稳定。在层序格架内分析了南堡凹陷东营组的沉积体系,东北部陡坡带以发育水下扇、扇三角洲为主,西北部和南部缓坡带发育三角洲、扇三角洲和辫状河三角洲。层序界面、准层序（组）叠加样式以及沉积体系空间展布均受到构造活动的控制,强构造活动期形成退积式叠加模式,而弱构造活动期对应进积式叠加模式。对层序发育和油气成藏条件分析认为层序1低位域的扇三角洲砂体和层序2中的浊积砂体为寻找岩性油气藏的有利部位。  相似文献   

Mechanism of carbonate cementation and its influence on reservoir in Pinghu Formation of Xihu Sag     

Haiqiang Bai  Xiaojun Xie  Gongcheng Zhang  Ying Chen  Ziyu Liu  Lianqiao Xiong  Jianrong Hao  Xin Li 《海洋学报(英文版)》2023,42(3):65-75

Carbonate cements are the most abundant authigenic mineral and impact on physical properties greatly in sandstone reservoir. In this paper, Pinghu Formation of Xihu Sag was taken as a target. Characteristics,distribution and formation of carbonate cements were investigated via optical microscopy, cathodoluminescence(CL), electron probe and in-situ carbon-oxygen isotope. The results showed that carbonate cements varied in types and shapes. Calcite/dolomite mainly present as poikilotopic cements, ...  相似文献   

Early Cenozoic paleontological assemblages and provenance evolution of the Lishui Sag,East China Sea     

Yingzhao Zhang  Yiming Jiang  Zhenghua Liu  Shuai Li  Ning Li  Jinshui Liu  Peijun Qiao  Kai Zhong  Shuhui Chen  Thian Lai Goh 《海洋学报(英文版)》2023,42(3):113-122

The East China Sea Shelf Basin generated a series of back-arc basins with thick successions of marine- and terrestrial-facies sediments during Cenozoic. It is enriched with abundant oil and gas resources and is of great significance to the petroleum exploration undertakings. Therein, the Lishui Sag formed fan delta, fluvial delta and littoral-to-neritic facies sediments during Paleocene–Eocene, and the research on its sedimentary environment and sediment source was controversial. This study analyzed the paleontological combination characteristics, and conducted a source-to-sink comparative analysis to restore the sedimentary environment and provenance evolution of the Lishui Sag during Paleocene–Eocene based on the integration of detrital zircon U-Pb age spectra patterns with paleontological assemblages. The results indicated that Lishui Sag was dominated by littoral and neritic-facies environment during time corroborated by large abundance of foraminifera, calcareous nannofossils and dinoflagellates. Chronological analysis of detrital zircon U-Pb revealed that there were significant differences in sediment sources between the east and west area of the Lishui Sag. The western area was featured by deeper water depths in the Paleocene–Eocene, and the sediment was characterized by a single Yanshanian peak of zircon U-Pb age spectra, and mainly influenced from Yanshanian magmatic rocks of South China Coast and the surrounding paleo-uplifts. However, its eastern area partly showed Indosinian populations. In particular, the upper Eocene Wenzhou sediments were featured by increasingly plentiful Precambrian zircons in addition to the large Indosinian-Yanshanian peaks, indicating a possible impact from the Yushan Low Uplift to the east. Therefore, it is likely that the eastern Lishui Sag generated large river systems as well as deltas during time. Due to the Yuquan Movement, the Lishui Sag experienced uplifting and exhumation in the late stage of the late Eocene and was not deposited with sediments until Miocene. Featured by transitional-facies depositions of Paleocene–Eocene, the Lishui Sag thus beared significant potential for source rock and oil-gas reservoir accumulation.  相似文献   

Controlling factors on the charging process of oil and gas in the eastern main sub-sag of the Baiyun Sag,Zhujiang River (Pearl River) Mouth Basin     

Cong Chen  Xiangtao Zhang  Guangrong Peng  Zulie Long  Baojun Liu  Xudong Wang  Puqiang Zhai  Bo Zhang 《海洋学报(英文版)》2023,42(3):189-200

The eastern main sub-sag (E-MSS) of the Baiyun Sag was the main zone for gas exploration in the deep-water area of the Zhujiang River (Pearl River) Mouth Basin at its early exploration stage, but the main goal of searching gas in this area was broken through by the successful exploration of the W3-2 and H34B volatile oil reservoirs, which provides a new insight for exploration of the Paleogene oil reservoirs in the E-MSS. Nevertheless, it is not clear on the distribution of “gas accumulated in the upper layer, oil accumulated in the lower layer” (Gas_upper-Oil_lower) under the high heat flow, different source-rock beds, multi-stages of oil and gas charge, and multi-fluid phases, and not yet a definite understanding of the genetic relationship and formation mechanism among volatile oil, light oil and condensate gas reservoirs, and the migration and sequential charge model of oil and gas. These puzzles directly lead to the lack of a clear direction for oil exploration and drilling zone in this area. In this work, the PVT fluid phase, the origin of crude oil and condensate, the secondary alteration of oil and gas reservoirs, the evolution sequence of oil and gas formation, the phase state of oil and gas migration, and the configuration of fault activity were analyzed, which established the migration and accumulation model of Gas_upper-Oil_lower co-controlled by source and heat, and fractionation controlled by facies in the E-MSS. Meanwhile, the fractionation evolution model among common black reservoirs, volatile reservoirs, condensate reservoirs and gas reservoirs is discussed, which proposed that the distribution pattern of Gas_upper-Oil_lower in the E-MSS is controlled by the generation attribute of oil and gas from source rocks, the difference of thermal evolution, and the fractionation controlled by phases after mixing the oil and gas. Overall, we suggest that residual oil reservoirs should be found in the lower strata of the discovered gas reservoirs in the oil-source fault and diapir-developed areas, while volatile oil reservoirs should be found in the deeper strata near the sag with no oil-source fault area.  相似文献   

惠民凹陷南坡石炭二叠系煤层二次生气模式     

何瑞武  杜玉民  刘金  刘玉亮 《煤田地质与勘探》2005,33(4):42-44

利用开放体系程序升温热模拟实验方法,对惠民凹陷南坡石炭—二叠系煤岩样品的热演化规律进行了研究,建立了该区石炭二叠系含煤地层有机质的生气模式,探讨了影响二次生气潜力的各种主控因素,为准确评价其资源潜力和计算远景资源量奠定了基础,对渤海湾盆地其他类似地区煤型气勘探具有指导意义。   相似文献