共查询到19条相似文献，搜索用时 125 毫秒
1.
运用测井信息评价烃源岩自开始以来已取得了长足进步,从定性的分析、识别发展到现在可定量计算地化指标,为克服因取芯不足而在区域范围内进行资源评价的难题创造了有利条件,烃源岩中有机质、粘土矿物是影响其测井响应的两个重要变量,测井对岩石中有机质和粘土矿物的类型、丰度、压实程度及富集状态不同而产生的岩石物理、电化学性质的差异,是利用测井信息识别和评价烃源岩的基础,随着油气勘探形势的严峻,烃源岩的测井研究将向更深层次的方向发展,烃源岩的地球化学特征与测井响应特征对应关系的机理研究、发展利用电化学性质进行烃源岩评价的方法、进行烃源岩的岩石物理实验与测井数值模拟将是今后开展烃源岩测井评价研究的新方向. 相似文献
2.
《地球物理学进展》2016,(6)
致密油勘探初期存在烃源岩取心少、实测样品分布不连续等问题;利用测井资料可定量评价烃源岩.烃源岩富含有机质,在测井曲线上常以高伽马、低密度、高声波时差、高电阻率、高中子孔隙度等特征呈现.论文系统介绍了ΔLogR法和多元回归法两种基于测井资料的烃源岩定量评价方法,并建立了相应的预测模型.通过建立的模型对鄂尔多斯盆地姬塬地区延长组长7段烃源岩有机碳含量进行预测,并对计算出的TOC数据(TOC_(计算))与实测TOC数据(TOC_(实测))进行了对比和分析.研究结果表明,研究区ΔLogR法与多元回归法中的双参数模型为较好的预测方法,且ΔLogR法预测结果明显优于多元回归法,优选ΔLogR法为最佳评价方法;并对出现这种情况的原因进行了分析. 相似文献
3.
烃源岩的定量地震刻画对于勘探开发区块的优选、盆地油气资源量的估算都具有重要意义.陆相沉积环境下的浅湖或半深湖相的烃源岩横向变化快,其空间展布需要依靠钻井约束下的反射地震进行刻画,但是其地震弹性特征与岩性和有机质含量的映射关系呈现高度非线性化,因而很难利用传统基于地震岩石物理模型驱动的烃源岩地震预测方法进行有效刻画.本文以低勘探区的东海盆地长江坳陷为例,提出了一种在数据驱动的机器学习框架下,综合利用地质约束、钻井录井、测井、地球化学和叠前地震数据进行烃源岩的定量地震刻画的工作流程.其核心思想是利用随机森林集成学习算法对小样本数据表现优异的特征,以井位处的测井弹性数据(纵波速度和密度)、岩性、地球化学标定的总有机碳含量(TOC)为样本标签数据,在地质导向约束下通过随机森林算法生成学习网络,并将该网络与叠前地震反演结果相结合,采取先预测泥岩再预测总有机碳含量的“两步走”策略,完成对烃源岩空间分布及其非均质性的定量地震刻画,并对预测结果的不确定性进行评价.测试结果显示,随机森林算法相较于其他的机器学习算法能够更准确的识别陆相沉积地层的泥岩,并比传统的利用阻抗转化方法获得更可靠的总有机碳含量预测结果. 相似文献
4.
由于钻井取心成本以及样品来源等原因的限制,利用测井资料来预测烃源岩中的有机碳含量(TOC)成为一种常用手段.本文剖析了前人提出的关于烃源岩TOC测井预测方法,包括自然伽马法、ΔLogR法及多元回归法,结合居延海坳陷的地质特征以及有关测井参数,对不同方法的预测结果进行误差对比分析,优选认为多元回归法能够较好的应用于研究区烃源岩TOC含量预测,并提出了适用于本研究区的以ΔLogR、深侧向电阻率和自然伽马为基本参数的多元回归预测模型.将该模型应用到研究区额探1井和额探2井的烃源岩TOC含量预测,在白垩系和二叠系识别出了多段厚度大于10 m的优质烃源岩,平均TOC含量都大于1.5%.由此表明优选出的预测模型对于居延海坳陷烃源岩TOC含量的预测具备重要意义,具有良好的应用前景. 相似文献
5.
多属性预测在涠西南凹陷烃源岩研究中的应用 总被引：1，自引：1，他引：0
寻找隐蔽油气藏是目前涠西南凹陷勘探的新领域,优质烃源岩描述是其中一个重要研究课题.涠西南凹陷流沙港组沉积时期为一断陷湖盆,流沙港组二段沉积阶段是湖盆发育的鼎盛时期,中深湖相泥岩或页岩发育,形成了一套良好的区域性烃源岩.油页岩是涠西南凹陷最重要的烃源岩.除油页岩外,流二段还沉积了厚套的中深湖相暗色泥岩,具备非常好的生烃能力.识别和弄清这些暗色泥岩在凹陷中的分布对定量评价涠西南凹陷的生烃潜力具有重要意义.本文尝试将地震多属性预测技术应用于优势烃源岩的研究.首先通过声波时差和电阻率曲线进行多元线性回归,拟合能够体现优势烃源岩特征的有机化学参数总有机碳TOC曲线,利用层位约束消除油页岩对属性优化的干扰作用,最后通过逐步回归的步聪法算法对多地震属性进行优化,找到最佳属性组合,实现TOC数据体的预测,揭示了流二段优质烃源岩的空间展布特征. 相似文献
6.
《地球物理学进展》2020,(4)
烃源岩总有机碳含量(TOC)的预测是烃源岩有机质丰度评价的重要一环.为解决传统ΔlogR方法应用于陆相深层烃源岩误差较大的问题.本文以ΔlogR法为基础,提出了一种考虑密度因素的广义ΔlogR法预测TOC.传统ΔlogR方法是一种基于测井曲线(声波、电阻率等)和成熟度参数(LOM)的预测TOC的方法,可以获得纵向上连续的有机碳分布,并且在国内外多个地区取得了较好的效果.但是研究表明,由于陆相深层烃源岩受到压实作用等影响,传统ΔlogR方法预测的结果不理想.干酪根有机质的密度远低于烃源岩基质密度,将考虑密度因素的广义ΔlogR法预测TOC的方法应用于渤中凹陷西南部东营组和沙河街组烃源岩,对其TOC进行分段预测,并与传统ΔlogR法、敏感测井多元回归方法预测结果进行对比,结果表明,研究区使用该方法的效果要优于其他两种方法.该方法拓展了传统ΔlogR法的适用范围,为烃源岩TOC的预测提供了新的思路和方法. 相似文献
7.
《地球物理学进展》2016,(5)
源储配置关系是致密油评价的核心组成部分.以鄂尔多斯盆地延长组长7段的岩心、测井资料为基础,经岩—电关系分析,优选深感应电阻率(RILD)与声波时差(AC)测井参数曲线重叠图法来识别烃源岩,并结合地球化学参数进行烃源岩品质评价;同时,开展砂体结构特征研究,并在单井、连井剖面中综合分析烃源岩品质、砂体结构特征、源储配置关系及含油性.研究表明:1)延长组长7段烃源岩发育段在深感应电阻率(RILD)与声波时差(AC)测井曲线重叠图上存在明显幅度差,累计厚度一般5~70 m,分布面积达10×104km;岩心分析及测井模型计算TOC值一般2%~20%,平均11.6%,TOC在平面上分布具较强非均质性;基于测试分析数据和实际生产需求,把鄂尔多斯盆地长7段泥页岩分为4类,优质烃源岩:TOC10%,中等烃源岩:6%TOC10%,差烃源岩:2%TOC6%,非烃源岩:TOC2%.2)影响鄂尔多斯盆地长7致密油富集程度的关键因素是烃源岩有机碳含量,其次是砂体结构,以及砂体与烃源岩之间的距离.一般在优质和中等烃源岩发育区,紧邻烃源岩的块状砂体的每米日产油指数(PI)一般大于2.0 t/m·d,远离优质或中等烃源岩的块状砂体PI一般为1.5t/m·d;不论层状砂体与烃源岩的距离远近,PI一般均为1.0t/m·d.差烃源岩发育区,紧邻或远离烃源岩发育区的块状砂体、层状砂体一般均为差油层或干层. 相似文献
8.
高演化海相碳酸盐烃源岩地球化学综合判识--以鄂尔多斯盆地为例 总被引：5，自引：0，他引：5
针对中国海相碳酸盐岩烃源岩的成熟度高、有机质丰度低等特殊性,以鄂尔多斯盆地下古生界为例, 通过微量元素富集系数计算、稀土元素的配分模式、元素和碳同位素等的数理统计分析及三维图解等多元综合分析, 结合必要的有机参数, 反演了盆地烃源岩发育环境, 评价碳酸盐岩烃源岩及其分布. 就鄂尔多斯盆地而言, TOC为0.2%是个重要的界限值, 研究表明: 在TOC>0.2%的层段中, Ba富集,δ13Ccarb正偏移, δ13Corg<-28‰, 反映出古生产力、有机质埋藏量较高, 具较好生烃潜力, 稀土元素分异强, 指示沉降速率低, 有机质保存条件好, 利于烃源岩发育.克里摩里组、乌拉力克组具一定规模, 可视为潜在有效烃源岩. 而TOC＜0.2%的层段, Ba含量低, δ13Ccarb多为负值,δ13Corg为-24‰～-28‰,指示有机质埋藏量低,生烃潜力差,稀土元素分异弱,沉降速率较快,多属浅水高能氧化环境,不利于烃源岩发育.利用无机与有机地球化学方法综合评价高演化海相有潜力的碳酸盐岩烃源岩及分布是可行的. 相似文献
9.
鄂尔多斯盆地长91湖相优质烃源岩的发育机制探讨 总被引：16，自引：0，他引：16
新近的钻探和有机地球化学测试与研究,在鄂尔多斯盆地上三叠统长9油层组上段发现了一套湖相优质烃源岩,其平均TOC达5.03%,平均沥青"A"含量达0.8603%,有机母质类型——以低等水生生物为主要来源的腐泥型,并已达到了生油高峰的热演化阶段.湖相优质烃源岩发育于湖盆的局部凹陷.各项有机、无机地球化学参数反映出长91优质烃源岩形成于淡水—微咸水、弱氧化—弱还原的半深湖相沉积环境.因此,高生产力是该套优质烃源岩形成的主控因素.薄层凝灰岩、纹层状凝灰岩的沉积,以及Eu显著正异常的发现,佐证了同期可能存在与火山喷发有关的缺氧地质事件.地质事件对长91优质烃源岩的发育起着重要的作用. 相似文献
10.
11.
利用ΔlogR技术计算柴达木盆地三湖地区第四系有机碳 总被引：2，自引：0，他引：2
利用ΔlogR技术计算有机碳是一种不同于传统地球化学测试得到的有机碳方法.该方法利用烃源岩有机碳含量在测井曲线(声波时差、电阻率)上的响应特征,建立测井解释模型,计算TOC的连续分布值,从而得到准确的有机碳含量,补充取心资料的不足.本文应用ΔlogR技术,结合实测数据,建立起三湖地区测井资料与有机碳含量之间的定量关系模型,然后利用该模型对三湖地区25口重点探井进行有机碳计算.结果表明:有机碳总体上数值含量偏低,平均值为0.33%;在纵向上,具有2个峰值,其中k5-k6峰值段是第四系最大湖泛期形成的沉积;在平面上,有机碳高值区位于台南-涩北构造以北和台吉乃尔与南陵丘以南区域,而南斜坡和涩南1井以东区域有机碳含量较低.本次研究获取了较为准确的烃源岩评价参数,最终得到该区第四系天然气资源量得到油田认可. 相似文献
12.
XiYuan Cai 《中国科学D辑(英文版)》2009,52(11):1791-1802
The Junggar Basin is one of the largest and most petroliferous superimposed petroleum basins in China. The central depression
area has become the frontier field for petroleum exploration. The characteristics of potential source rocks and reservoir
sandstones, and the pressure regime in the central Junggar Basin were studied. Permian shales are dominated by hydrogen-rich,
oil-prone algal organic matter, and Jurassic mudstones are dominated by hydrogen-poor, higher-plant derived organic matter.
These source rocks are widespread and have been mature for hydrocarbon generation, suggesting good to excellent exploration
potential, both for crude oils and for natural gases. The deeply buried Jurassic sandstones usually have low porosity and
permeability. However, sandstones beneath the Jurassic/Cretaceous unconformity display relatively high porosity and permeability,
suggesting that meteoric water leaching had improved the quality of the sandstones. Overpressure developed over much of the
central Junggar Basin. The overpressured rocks are characterized by slightly increased interval transit time, low sandstone
permeability, increased organic matter maturity, and high relative hydrocarbon-gas contents. Mudstones in the overpressured
system have quite the same clay mineral compositions as mudstones in the lower part of the normally pressured system. Overpressure
generation in the central Junggar Basin is best to be explained as the result of hydrocarbon generation and fluid retention
in low-permeability rocks. Petroleum generated from Permian and Jurassic source rocks could migrate laterally through preferential
petroleum migration pathways and accumulated in structural traps or lithological traps in the overpressured system, or migrate
vertically through faults/hydraulic fractures into the overlying, normally pressured system and accumulate in structural or
lithological traps. Therefore, commercial petroleum reservoirs could be potentially found in both the overpressured system,
and in the normally pressured system. 相似文献
13.
As revealed from recent drilling and organic geochemical testing and research, a series of lacustrine high-grade hydrocarbon source rocks was discovered in the upper section of the Chang 9 oil reservoir member of upper Triassic in Ordos Basin. The hydrocarbon source rocks show average TOC content as high as 5.03%, average bitumen "A" content as high as 0.8603%, and good quality organic precursors, which are of the sapropelic type mainly derived from lower aquatic plants and have reached the thermal evolution stage featured by oil-producing climax. Generally the lacustrine high-grade hydrocarbon source rocks were developed in local depressions of a lake basin, and the Chang 91 member was particularly formed in a depositional environment characterized by fresh water to weakly saline water, weakly oxidizing to weakly reducing setting and semi-deep lake facies, as was demonstrated by a variety of organic to inorganic geochemical parameters. As a result, high productivity constitutes the principal controlling force for generation of this series of high-grade hydrocarbon source rocks. Deposition of thinly-bedded and laminated tuffs as well as positive Eu anomaly corroborate the possible occurrence of anoxic geological event closely related to contemporaneous volcanic eruption, which would play a key part in development of the Chang 91 member of high-grade hydrocarbon source rocks. 相似文献
14.
Distribution and geological significance of 17α(H)-diahopanes from different hydrocarbon source rocks of Yanchang Formation in Ordos Basin 总被引：2，自引：0，他引：2
Based on GC-MS testing data of many saturated hydrocarbon samples, 17α(H)-C30 diahopanes (C30
*) are extensively distributed in the lacustrine hydrocarbon source rocks of the Yanchang Formation in Ordos Basin, but show
remarkable differences in relative abundance among various source rocks. Generally, Chang 7 high-quality source rock (oil
shale) developed in deep lake anoxic environment shows lower C30
* content, whereas Chang 6–9 dark mudstone developed in shallow to semi-deep lake, sub-oxidizing environment shows relatively
high to high C30
* value. Particularly, Chang 7 and Chang 9 black mudstones in Zhidan region in the northeast of the lake basin show extremely
high C30
* value. A comparative analysis was made based on lithology, organic types and various geochemical parameters indicative of
redox environment, and the results indicate that environmental factors such as redox settings and lithology are key factors
that control the C30
* relative abundance, while organic types and maturity may be minor factors. High to extremely high C30
* values are indicative of sub-oxidizing environment of fresh-brackish water and shallow to semi-deep lake. Therefore, research
on C30
* relative content and distribution in lacustrine hydrocarbon source rocks in the Yanchang Formation, especially on the difference
in C30
* between Chang 7 high-quality source rocks (oil shale) and Chang 6–91 source rocks (dark mudstone), will provide an important approach for classification of Mesozoic lacustrine crudes and detailed
oil-source correlation in the basin.
Supported by National Natural Science Foundation of China (Grant No. 40773028) 相似文献
15.
As revealed from recent drilling and organic geochemical testing and research, a series of lacustrine high-grade hydrocarbon source rocks was discovered in the upper section of the Chang 9 oil reservoir member of upper Triassic in Ordos Basin. The hydrocarbon source rocks show average TOC content as high as 5.03%, average bitumen “A” content as high as 0.8603%, and good quality organic precursors, which are of the sapropelic type mainly derived from lower aquatic plants and have reached the thermal evolution stage featured by oil-producing climax. Generally the lacustrine high-grade hydrocarbon source rocks were developed in local depressions of a lake basin, and the Chang 91 member was particularly formed in a depositional environment characterized by fresh water to weakly saline water, weakly oxidizing to weakly reducing setting and semi-deep lake facies, as was demonstrated by a variety of organic to inorganic geochemical parameters. As a result, high productivity constitutes the principal controlling force for generation of this series of high-grade hydrocarbon source rocks. Deposition of thinly-bedded and laminated tuffs as well as positive Eu anomaly corroborate the possible occurrence of anoxic geological event closely related to contemporaneous volcanic eruption, which would play a key part in development of the Chang 91 member of high-grade hydrocarbon source rocks. 相似文献
16.
As revealed from recent drilling and organic geochemical testing and research, a series of lacustrine high-grade hydrocarbon source rocks was discovered in the upper section of the Chang 9 oil reservoir member of upper Triassic in Ordos Basin. The hydrocarbon source rocks show average TOC content as high as 5.03%, average bitumen “A” content as high as 0.8603%, and good quality organic precursors, which are of the sapropelic type mainly derived from lower aquatic plants and have reached the thermal evolution stage featured by oil-producing climax. Generally the lacustrine high-grade hydrocarbon source rocks were developed in local depressions of a lake basin, and the Chang 91 member was particularly formed in a depositional environment characterized by fresh water to weakly saline water, weakly oxidizing to weakly reducing setting and semi-deep lake facies, as was demonstrated by a variety of organic to inorganic geochemical parameters. As a result, high productivity constitutes the principal controlling force for generation of this series of high-grade hydrocarbon source rocks. Deposition of thinly-bedded and laminated tuffs as well as positive Eu anomaly corroborate the possible occurrence of anoxic geological event closely related to contemporaneous volcanic eruption, which would play a key part in development of the Chang 91 member of high-grade hydrocarbon source rocks.
相似文献17.
Aromatic hydrocarbons are generally main distillation of crude oil and organic extract of source rocks. Bicyclic and tricyclic aromatic hydrocarbons can be purified by two-step method of chromatography on alumina. Carbon isotopic composition of individual aromatic hydrocarbons is affected not only by thermal maturity, but also by organic matter input, depositional environment, and hydrocarbon generation process based on the GC-IRMS analysis of Upper Ordovician, Lower Ordovician, and Cambrian source rocks in different areas in the Tarim Basin, western China. The subgroups of aromatic hydrocarbons as well as individual aromatic compound, such as 1-MP, 9-MP, and 2,6-DMP from Cambrian-Lower Ordovician section show more depleted 13 C distribution. The 13 C value difference between Cambrian-Lower Ordovician section and Upper Ordovician source rocks is up to 16.1‰ for subgroups and 14‰ for individual compounds. It can provide strong evidence for oil source correlation by combing the 13 C value and biomarker distribution of different oil and source rocks from different strata in the Tarim Basin. Most oils from Tazhong area have geochemical characteristics such as more negative 13C9-MP value, poor gammacerane, and abundant homohopanes, which indicate that Upper Ordovician source rock is the main source rock. In contrast, oils from Tadong area and some oils from Tazhong area have geochemical characteristics such as high 13C9-MP value, abundant gammacerane, and poor homohopanes, which suggest that the major contributor is Cambrian-Lower Ordovician source rock. 相似文献
18.
HU Kai ZHAI Jianping LIU Yingjun WANG Henian ZHANG Jingrong JIA Rongfen 《中国科学D辑(英文版)》2000,43(5):507-520
The organic matter of three different chronological major carbonaceous rock gold-bearing formations of South China (Middle
Proterozoic Shangqiaoshan group of northeastern Jiangxi, Lower Cambrian Shuikou group of northern Guangxi and Devonian Shetianqiao
group of eastern Hunan) and related carbonaceous stratabound gold deposits such as Jinshan, Longshui and Shixia deposits,
respectively, has been characterized by organic geochemical techniques. These organic geochemical results show that the average
total organic carbon (TOC) content of the three chronological carbonaceous rock gold-bearing formations of South China ranges
from 0.15% to 1.56%. The thermal maturity of the organic matter of host rocks in the three gold-bearing formations is high.
The micro-component of the organic matter of the host rocks consists primarily of solid bitumen and graphite. The organic
carbon and gold of the host rocks appear to syndepositin situ during the formation of the gold-bearing formations. The organic carbon played a certain role in controlling the geochemical
environment of the gold-bearing formations. The metallogenetic mechanism of the carbonaceous rock stratabound gold deposits
of South China is closely associated in genesis with the sedimentation, diagenesis and thermal evolution history of the organic
matter of host rocks in the gold-bearing formations. 相似文献
19.
Jiao YangQuan Wu LiQun He MouChun Roger Mason Wang MinFang Xu ZhiCheng 《中国科学:地球科学(英文版)》2007,50(2):114-123
The Lucaogou Formation carbonate-rich oil shale source rock is exposed at the southern margin of the Junggar Basin, Xinjiang, NW China. We have sampled it in detail and conducted microstructural, mineralogical and geochemical studies, including thin section petrography, UV fluorescence petrography, X-ray diffraction, vitrinite reflectance, bitumen reflectance, fluid inclusion analysis and Raman spectroscopy. Organic matter is disseminated through the carbonate-bearing siltstone source rocks and concentrated in numerous bedding parallel stylolites and in two sets of carbonate veins, one along bedding parallel fractures and the other cross-cutting stylolites and bedding. The research about maturity of organic matter finds vitrinite reflectance values increase from the dispersed kerogen (0.64%) to the stylolites (the one of oriented vitrinite is 0.72% and the one of migrated bitumen is 2.38%); Homogenization temperatures of fluid inclusions in veins containing hydrocarbon fluid inclusions show an increase from 178.5°C in the bedding parallel veins to 222°C in the cross-cutting veins, confirmed by Raman spectroscopy. These results support a model of progressive heating accompanied by fluid loss during later stages of thermal maturation of source rock and the onset of primary migration. Obviously, the occurrence of organic matter is the trace of hydrocarbon primary migration, and the bedding lamination surfaces and cross-cutting fissures are the principal pathways of hydrocarbon-bearing fluids migration. Bedding lamination surfaces evolved into stylolites along the earliest primary migration pathways, followed by bedding parallel and cross-cutting fissures.
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