A novel method to estimate mineral compositions of mudrocks: A case study for the Canadian unconventional petroleum systems     

《Marine and Petroleum Geology》2016

The mineral composition of mudrocks is an essential attribute in controlling the reservoir quality of unconventional petroleum systems. The present study introduces a semi-quantitative method to estimate mineral phases of mudrocks in various Canadian unconventional hydrocarbon systems using total elemental analysis (inductively coupled plasma-mass spectrometry (ICP-MS)) and Rock-Eval data (total organic carbon (TOC) and mineral carbon (MinC)).This method involves statistical analysis based on a sound knowledge of hydrocarbon source rock inorganic geochemistry. The workflow can be divided into four steps: (i) converting major elements (Si, Al, Fe, K, Na, Ca, Mg, Ti, and P) to their oxides, (ii) inferring modes of occurrence of elements using statistical analysis of geochemical data (major elements, TOC, and MinC), (iii) identifying the mineral types (oxide, aluminosilicates, carbonates, sulfide, and phosphate) according to elemental occurrences and calculating mineral phase concentrations, and (iv) verifying the results by comparing to XRD data on selected samples. The results, especially for brittle minerals such as quartz, carbonates (e.g. calcite, dolomite, and ankerite), and pyrite, show that the estimated mineral compositions correspond closely and consistently with measured mineralogy obtained from XRD. This method takes advantage of bulk geochemical data already available for hydrocarbon potential and chemostratigraphic studies, without devoting additional samples and cost for XRD analysis.  相似文献   

Tectono–Thermal Evolution, Hydrocarbon Filling and Accumulation Phases of the Hari Sag, in the Yingen–Ejinaqi Basin, Inner Mongolia, Northern China     

YANG Peng  REN Zhanli  XIA Bin  TIAN Tao  ZHANG Yong  QI Kai  REN Wenbo 《《地质学报》英文版》2018,92(3):1157-1169

This work restored the erosion thickness of the top surface of each Cretaceous formations penetrated by the typical well in the Hari sag, and simulated the subsidence burial history of this well with software BasinMod. It is firstly pointed out that the tectonic subsidence evolution of the Hari sag since the Cretaceous can be divided into four phases: initial subsidence phase, rapid subsidence phase,uplift and erosion phase, and stable slow subsidence phase. A detailed reconstruction of the tectonothermal evolution and hydrocarbon generation histories of typical well was undertaken using the EASY R_0% model, which is constrained by vitrinite reflectance(R_0) and homogenization temperatures of fluid inclusions. In the rapid subsidence phase, the peak period of hydrocarbon generation was reached at c.a.105.59 Ma with the increasing thermal evolution degree. A concomitant rapid increase in paleotemperatures occurred and reached a maximum geothermal gradient of about 43-45℃/km. The main hydrocarbon generation period ensued around 105.59-80.00 Ma and the greatest buried depth of the Hari sag was reached at c.a. 80.00 Ma, when the maximum paleo-temperature was over 180℃.Subsequently, the sag entered an uplift and erosion phase followed by a stable slow subsidence phase during which the temperature gradient, thermal evolution, and hydrocarbon generation decreased gradually. The hydrocarbon accumulation period was discussed based on homogenization temperatures of inclusions and it is believed that two periods of rapid hydrocarbon accumulation events occurred during the Cretaceous rapid subsidence phase. The first accumulation period observed in the Bayingebi Formation(K_1 b) occurred primarily around 105.59-103.50 Ma with temperatures of 125-150℃. The second accumulation period observed in the Suhongtu Formation(K_1 s) occurred primarily around84.00-80.00 Ma with temperatures of 120-130℃. The second is the major accumulation period, and the accumulation mainly occurred in the Late Cretaceous. The hydrocarbon accumulation process was comprehensively controlled by tectono-thermal evolution and hydrocarbon generation history. During the rapid subsidence phase, the paleo temperature and geothermal gradient increased rapidly and resulted in increasing thermal evolution extending into the peak period of hydrocarbon generation,which is the key reason for hydrocarbon filling and accumulation.  相似文献   

柴达木盆地东部上石炭统克鲁克组碎屑岩储层特征及控制因素     

祁柯宁  彭博  李宗星  刘成林  谢庆宾 《地质论评》2018,64(5):1263-1276

柴达木盆地上石炭统克鲁克组是该区重要的古生界勘探层位,组内发育多套良好的碎屑岩层。为探究其岩石物性特征及控制因素,本次以野外露头调查为基础,利用普通薄片、铸体薄片鉴定及扫描电镜等手段,结合物性测试和压汞资料,对克鲁克组碎屑岩纵向分布规律,储层岩性、物性、孔喉特征及孔隙类型进行分析。认为克鲁克地层中克2段发育的三角洲前缘亚相和克3段的具障壁海岸潮坪相的大套含砾粗砂岩、粗砂岩砂体原生、次生孔洞发育,孔喉大、分布集中、分选好,为有利的碎屑岩储层。早成岩期压实作用、重结晶及胶结作用对克鲁克组砂岩的原生孔隙破坏严重,晚成岩期储层改造形成的溶孔、裂缝—溶孔是油气成藏的主要储存空间。该研究为预测柴东石炭系克鲁克组油气有利区域提供依据,为今后该地区的油气勘探提供理论支撑。  相似文献   

多相糜棱岩内第二相对应变局部化的影响——以秦岭群花岗质糜棱岩为例     

韩宁  赵中宝  王根厚  孙丽静  巴合达尔·巴勒塔别克 《地质学报》2021,95(5):1614-1629

糜棱岩韧性变形发生的应变局部化过程,尤其是多相糜棱岩第二相对基质相变形的影响一直是显微构造研究难点.研究表明糜棱岩借助颗粒边界滑移实现多相混合,形成多矿物相集合体.在多相糜棱岩内,第二相在基质相颗粒边界施加齐纳阻力,牵制基质相颗粒边界的迁移速率,破坏基质相颗粒的动态平衡过程,使基质相颗粒位于古应力计对应的颗粒粒度以下,导致基质相整体的表面积增大,促进扩散交换过程,提高了扩散蠕变,降低了基质相位错蠕变和结晶学优选方位(CPO)形成的效率,使变形机制从颗粒粒径不敏感蠕变机制(GSI)过渡为颗粒粒径敏感蠕变机制(GSS).另外,多相糜棱岩内的第二相具有诱导应变局部化的效应,使塑性应变局部化更为强烈,引起物质强度的变化,进而引起岩石变形过程和岩石圈流变行为的改变.选取秦岭群花岗质糜棱岩进行多相矿物糜棱岩定量化研究,结果显示花岗质糜棱岩伴随着云母含量的增多以及各相混合程度的增大,石英的颗粒粒度明显减小,CPO强度显著降低,基质相显微变形受第二相控制逐渐增强.  相似文献   

全风化花岗岩地层中高固相离析浆液灌浆机理研究          下载免费PDF全文

赵钰  郑洪  曹函  林飞  王旭斌  贺茉莉 《水文地质工程地质》2021,48(2):78-88

全风化花岗岩地层稳定性差、遇水易发生崩解,工程上使用常规材料防渗加固注浆时效果较差。针对这一情况,依托湖南省郴州市莽山水库防渗加固灌浆项目,通过自主设计的全风化花岗岩地层注浆室内模拟试验装置,进行模拟注浆试验,实现了浆液在整个注浆过程中的扩散情况模拟,对不同注浆压力、不同位置点所取试样开展单轴抗压、抗剪强度及渗透率测试试验,对不同注浆压力下完整结石体取样观察,研究以全风化花岗岩颗粒为配方主体材料的高固相离析浆液在全风化花岗岩地层的防渗加固效果及浆液扩散模式。结果表明:该浆液在全风化花岗岩地层扩散过程中经历了渗透扩散、挤密压缩、劈裂扩展三个阶段,是一种复合注浆形式;以全风化花岗岩颗粒为主体的高固相离析浆液在全风化花岗岩地层注浆中效果显著,随着注浆压力提升,单轴抗压强度显著提升为原土体的3.25～13.67倍,抗剪强度在不同法向压力情况下提升为原土体的1.63～2.69倍,渗透系数从10?4 cm/s下降至10?5 cm/s甚至10?6 cm/s。  相似文献   

水合物地层低热固井水泥浆用相变微胶囊的制备及应用          下载免费PDF全文

杨国坤  汪爱明  尹舒婷  代天  刘天乐  蒋国盛 《探矿工程》2021,48(3):118-124

当深海固井遇到天然气水合物地层时,由于水泥浆水化放热,导致水合物的相变平衡条件发生改变,诱发水合物分解,引起二界面胶结质量下降等问题。为提高水合物地层固井质量,可向水泥浆中添加具有吸热控温作用的相变微胶囊,可有效降低固井水泥浆的水化升温。基于此,以配比石蜡为控温芯材、碳酸钙为壁材,利用自组装法制备了一种使用于深水水合物地层固井水泥浆控温微胶囊。由于固井水泥浆在达到水合物地层的过程中,外界温度环境复杂,单一相变温度的控温芯材极易失效。为扩展控温区间,选用切片石蜡与白油作为混合芯材,控温区间达到14.8~39.8 ℃。研究表明,该微胶囊表观形态良好、彼此无团聚,在热循环过程中,不易发生泄漏。与水泥浆复配后,对水泥浆流变性能无明显影响。在低掺加量时,微胶囊主要起降低水泥浆峰值温度的效果,并提升水泥石整体力学强度;高掺加量时,微胶囊既可以有效降低水泥浆峰值温度,也可以明显地延缓水泥浆放热速率。  相似文献   

CINRAD-SA双偏振雷达资料在降水估测中的应用初探   总被引：2，自引：0，他引：2  

陈超  胡志群  胡胜  张扬  李珊珊 《气象》2019,45(1):113-125

对基于水平反射率ZH和差分传播相移率K_(DP)的降水估测综合法R(C)进行了改进,并对广州S波段双偏振雷达2016年2次飑线和2次台风降水过程的Φ_(DP)使用小波分析进行滤波处理,在此基础上使用变距最小二乘法拟合得到K_(DP)的值。分别使用R(C)和R(Z_H)法对2次飑线和2次台风降水过程进行降水估算,将估算结果和雨量计小时雨量进行了对比,并将两种方法的评估结果进行了对比。结果表明:(1)对于飑线类型降水,R(C)法对5 mm·h~(-1)以上的降水估测精度要好于R(Z_H)法,且降水率越大,R(C)法优势越明显,当降水率≥20 mm·h~(-1)时,两次过程R(C)法比R(Z_H)法的平均相对误差(RE)降低了17. 2%,平均绝对误差(AE)减少了1.89 mm,平均均方根误差(RMSE)减少了1.66 mm;(2)对于台风类型降水,R(C)法对5 mm·h~(-1)以上的降水估测精度也好于R(Z_H)法,当降水率≥20 mm·h~(-1)时,两次过程R(C)法比R(Z_H)法的平均RE降低了33. 19%,平均AE减少了3. 95 mm,平均RMSE减少了4.05 mm;(3)对于飑线和台风两种类型降水R(C)法都明显改善了降水率较大时的R(Z_H)法低估问题,但R(C)法在降水率10 mm·h~(-1)时也存在低估,可能是由雨滴谱资料观测误差导致拟合的系数偏小或雷达硬件造成的观测偏差等造成的。  相似文献   

CHARACTERISTICS OF TORSIONAL GROUND MOTIONS     

H. HAO 《地震工程与结构动力学》1996,25(6):599-610

Due to the inherent difficulty in directly recording the rotational ground motions, torsional ground motions have to be estimated from the recorded spatially varying translational motions. In this paper, an empirical coherency function, which is based on the recorded motions at the SMART-1 array, is suggested to model the spatial variation of translational motions. Then, the torsional ground motion power spectral density function is derived. It depends on the translational motion power spectral density function and the coherency function. Both the empirical coherency function and the torsional motion power spectral density function are verified by the recorded motions at the SMART-1 array. The response spectra of the torsional motions are also estimated. Discussion on the relations between the torsional motion response spectrum and the corresponding translational motion response spectrum is made. Numerical results presented can be used to estimate the torsional ground motion power spectral density function and response spectrum.  相似文献   

卡尔曼滤波在InSAR噪声消除与相位解缠中的应用   总被引：10，自引：4，他引：6  

刘国林  独知行  薛怀平  郝晓光 《大地测量与地球动力学》2006,26(2):66-70

相位解缠作为InSAR技术中的关键步骤,一直是研究的难点和热点。通常的相位解缠方法在相位解缠前首先必须进行噪声消除,而卡尔曼滤波将相位解缠问题转化为状态估计问题,实现了相位解缠与噪声消除一并处理,成为一种相位解缠新途径。并提出了卡尔曼滤波在相位解缠与噪声抑制中的一种新算法。  相似文献   

叠后地震属性分析在油气田勘探开发中的应用   总被引：29，自引：24，他引：5       下载免费PDF全文

吕公河  于常青  董宁 《地球物理学进展》2006,21(1):161-166

地震属性分析技术一直是地震特殊处理和解释的主要研究内容.随着油气勘探开发的发展,地震属性分析技术已经成为油藏地球物理研究的核心内容,是勘探地震与开发地震之间纽带.本文针对鄂尔多斯盆地的低幅度构造、低孔隙、低渗透率、致密性隐蔽油气藏的特点,综合应用相干数据体分析、地震相自动分类定性识别砂体厚度、地震振幅属性分析、频谱分解、多井约束的储层叠后反演等叠后属性分析技术,探索了一套适合该区油气特征的储层横向预测及油气识别模式.为该区油气勘探开发,储量计算提供可靠依据.同时也为隐蔽性油气藏的勘探开发积累了经验.  相似文献