Hydrocarbon generation and expulsion characteristics of Lower Permian P1f source rocks in the Fengcheng area,northwest margin,Junggar Basin,NW China: implications for tight oil accumulation potential assessment     

Tao Hu  Xiongqi Pang  Sa Yu  Xulong Wang  Hong Pang  Jigang Guo  Fujie Jiang  Weibing Shen  Qifeng Wang  Jing Xu 《Geological Journal》2016,51(6):880-900

Combined with the actual geological settings, tight oil is the oil that occurs in shale or tight reservoirs, which has permeability less than 1 mD and is interbedded with or close to shale, including tight dolomitic oil and shale oil. The Fengcheng area (FA), at the northwest margin of the Junggar Basin, northwest China, has made significant progress in the tight oil exploration of the Fengcheng (P₁f) Formation recently, which indicates that the tight oil resources have good exploration prospects. Whereas the lack of recognition of hydrocarbon generation and expulsion characteristics of Permian P₁f source rocks results in the misunderstanding of tight oil resource potential. Based on the comprehensive analysis of geological and geochemical characteristics of wells, seismic inversion, sedimentary facies, tectonic burial depth, etc., the characteristics of P₁f source rocks were investigated, and the horizontal distributions of the following aspects were predicted: the thickness of source rocks, abundance and type of organic matter. And on this basis, an improved hydrocarbon generation potential methodology together with basin simulation techniques was applied to unravel the petroleum generation and expulsion characteristics of P₁f source rocks in FA. Results show that the P₁f source rocks distribute widely (up to 2039 km²), are thick (up to 260 m), have high total organic content (TOC, ranging from 0.15 to 4 wt%), are dominated by type II kerogen and have entered into low mature–mature stage. The modeling results indicate that the source rocks reached hydrocarbon generation threshold and hydrocarbon expulsion threshold at 0.5% Ro and 0.85% Ro and the comprehensive hydrocarbon expulsion efficiency was about 46%. The amount of generation and expulsion from the P₁f source rocks was 31.85 × 10⁸ and 15.31 × 10⁸ t, respectively, with a residual amount of 16.54 × 10⁸ t within the source rocks. Volumetrically, the geological resource of shale oil is up to 15.65 × 10⁸ t. Small differences between the amounts calculated by the volumetric method compared with that by hydrocarbon generation potential methodology may be due to other oil accumulations present within interbedded sands associated with the oil shales. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

Geochemistry and Provenance of Maastrichtian Clastic Rocks in the Dikmendede Formation of Orhaniye in Kazan-Ankara-Turkey Region   总被引：1，自引：0，他引：1  

Ali Mujdat OZKAN  Ayla AYAZ-BOZDAG 《《地质学报》英文版》2011,85(5):1067-1083

An integrated petrographic and geochemical study of the sandstones of the Maastrichtian-aged in the Orhaniye (Kazan-Ankara-Turkey) was carried out to obtain more information on their provenance, sedimentological history and tectonic setting. Depending on their matrix and mineralogical content, the Maastrichtian sandstones are identified as lithic arenite/wacke. The Dikmendede sandstones derived from types of provenances, the recycled orogen and recycled transitional. The chemical characteristics of the Dikmendede sandstones, i.e., fairly uniform compositions, high Th/U ratios (>3.0), negative Eu anomalies (Eu/Eu* 0.72–0.99) and Th/Sc ratios (mostly less than 1.0), favor the OUC (old upper continental crust) provenance for the Dikmendede sandstones. The SiO2/Al2O3, Th/Sc (mostly <1.0) and La/Sc (<4.0) ratios are; however, slightly lower than typical OUC, and these ratios may suggest a minor contribution of young arc-derived material. The rare earth element (REE) pattern, and La/Sc versus Th/Co plot suggests that these sediments were mainly derived from felsic source rocks. The Dikmendede sandstones have high Cr (123–294 ppm) and Ni (52–212 ppm) concentrations, Cr/Ni ratio of 1.93, and a medium correlation coefficient between Cr and Ni and corresponding medium to high correlation of both (Cr and Ni, respectively) elements with Co. These relationships indicate a significant contribution of detritus from ophiolitic rocks. As rare earth element data are available for the Dikmendede sandstones, the Eu/Eu* is compared with LaN/YbN. Samples plot in the area of overlapping between continental collision, strike-slip and continental arc basins. The predominantly felsic composition of the Dikmendede sandstones is supported by the REE plots, which show enriched light REE, negative Eu anomaly and flat or uniform heavy REE. The Dikmendede sandstones have compositions similar to those of the average upper continental crust and post-Archean Australian shales. This feature indicates that the sediments were derived mainly from the upper continental crust. The Dikmendede sandstones have chemical index of alteration (CIA) values of 28–49, with an average of 40 indicating a low degree of chemical weathering in the source area. The compositional immaturity of the analyzed sandstone samples is typical of subduction-related environments, and their SiO2/Al2O3 and K2O/Na2O ratios and Co, Sc, Th and Zr contents reflect their oceanic and continental-arc settings. The Dikmendede sandstones were developed as flysch deposits derived from mixed provenance in a collision belt.  相似文献   

高密度采集地震资料对缝洞型储层预测精度的影响分析     

王雪梅  章雄  杨晓  张琳  文向东  管敏 《物探化探计算技术》2011,33(6):642-648,574,575

四川盆地蜀南地区下二叠统茅口组缝洞型储层具有强烈的非均质性特征,而且埋藏相对较深,信噪比和分辨率较低,地震预测的难度大。这里通过模型正演,分析不同道距二维地震资料对茅口组单缝洞体储层的分辨能力,并且在资料处理中,研究了高密度地震资料对抑制空间假频,以及提高横向分辨率的影响,最后通过实际资料对比和速度反演,进一步分析证实了高密度采集地震资料,能够有效提高缝洞型储层的预测精度。  相似文献   

电阻率法找水在四平市区应用的体会     

张德祥  李晓峰  李树金 《吉林地质》2011,30(1):89-91

用电阻率法找水是物探找水中应用最广的一种方法,本文根据多年的工作经验,总结性的论述了电阻率法在碎屑岩地区找水的工作经验,具有一定的指导作用.  相似文献   

Hybrid Sedimentation in Late Permian-Early Triassic in Western Sichuan Basin,China     

龙胜祥  吴世祥  李宏涛  白振瑞  马金钰  张华 《中国地质大学学报(英文版)》2011,(3)

Mixed carbonate-siliciclastic sedimentation is common in the Upper Permian-Lower Tri-assic in the western Sichuan(四川) basin.The extensional movement was strong in the Late Permian,resulting in differential uplifting of fault blocks.During this period,there was an extensive retrogres-sion.The Kangdian(康滇) ancient land progressive uplifted and enlarged,forming the major prove-nance of terrigenous clastics.In Changxingian age,mixed terrigenous-carbonate sedimentation was dis-tributed in the area between Dafeis...  相似文献   

会理大铜厂铜矿成矿物质来源及矿床成因浅析     

陈钧渝  刘兴德  杨忠芳 《四川地质学报》2011,(4):412-416

大铜厂铜矿位于会理断陷盆地,产于中生代白垩世小坝组砂、砾岩地层中,是砂砾岩型铜矿床的典型代表.通过对常、微量元素,稀土元素,稳定同位素及碎屑物等特征分析,发现矿石与围岩具有明显的同源性,显示成矿物质主要来源于地层建造,远端矿源为摩挲营花岗岩体和龙帚山玄武岩体.同时综合其他成矿特征,对矿床成因做出简要分析.  相似文献   

川西坳陷丰谷构造上三叠统须家河组四段致密砂岩储层特征   总被引：1，自引：0，他引：1  

刘春富  刘树根  赵霞飞  陈杨 《四川地质学报》2011,31(2):167-172,175

据丰谷地区须家河组的地表剖面、岩心和薄片、测井曲线及常规物性测试资料等的观察、对比分析,认为川西坳陷中段的丰谷地区上三叠统须家河组四段砂岩普遍具有低孔低渗、致密化强、超高压、岩性变化快、非均质性强等特点,但局部仍发育有孔渗性相对较好的层段.根据沉积作用及沉积相、成岩作用类型、构造作用方面来探讨丰谷地区须四段储层的特征及...  相似文献   

华庆地区延长组长6油层组储集砂岩特征及对储层物性的影响          下载免费PDF全文

苏楠  隆昊  田景春  王卫红  张锦泉 《沉积与特提斯地质》2011,31(1):65-71

长6油层组储集砂岩主要为岩屑长石砂岩,粒度较细,分选中等偏差,填隙物主要为碳酸盐矿物和粘土矿物。砂岩的物质组成影响着其储层性能,储层物性随着石英含量的增加而变好,而随着岩屑含量的增加而变差。砂岩中长石的溶蚀作用是改善储层物性的关键因素。填隙物的含量越大,则孔隙喉道堵塞和充填的程度增加,导致储层物性变差。  相似文献   

川东北宣汉-达县地区长兴组-飞仙关组礁滩储层特征及其控制因素          下载免费PDF全文

程锦翔  郭彤楼  谭钦银  王瑞华  张清洪 《沉积与特提斯地质》2011,(3):64-70

川东北宣汉-达县地区是我国重要的气藏发育区块。为了深入探索储层特征、物性与岩石类型,成岩作用的相关性,运用薄片鉴定、扫描电镜等技术手段,结合物性测试数据,测井资料和压汞数据,对储层的岩石类型,孔隙类型,孔隙结构、物性特征以及储层展布进行分析。研究表明,川东北宣汉-达县地区优质储层为生物礁白云岩及鲕粒白云岩,经历过重结晶及多期溶蚀,粒间溶孔最为发育。长兴组储层孔隙度平均值为5．4％。渗透率平均值为93．41×10^-3μm^2;飞仙关组储层平均孔隙度为8％,平均渗透率为132,76×10^-3μm^2,孔喉结构良好。沉积相控制储层的岩石类型和展布,成岩作用尤其是溶蚀作用控制着储层的物性,而构造作用对储层的形成则有双重影响。  相似文献   

常见小波的尺度进制求解算法与程序     

黄苹  袁晓 《成都信息工程学院学报》2011,(4):144-148

基于小波变换的稳定性函数来研究尺度进制的算法。用母波的频谱函数来构造出尺度进制为任意进制时的稳定性函数,根据稳定性函数计算小波框架的边界、紧致度和收敛因子,最后由框架参数值进一步计算得到尺度进制范围。结果表明,此范围有效地缓解了小波变换的稳定性和冗余性之间的矛盾。  相似文献