鄂尔多斯盆地西峰油田白马南特低渗岩性油藏储层地质建模   总被引：2，自引：0，他引：2  

李红  柳益群 《沉积学报》2007,25(6):954-960

以鄂尔多斯盆地西峰油田白马南长81砂岩油藏为例，应用随机序贯高斯模拟法（SUS）和序贯指示模拟法（SIS）建立研究目标的储层地质模型，进而探讨了在特低渗岩性油藏中相对高渗透储层形成的控制因素。认为长81油藏储层的形成主要受控于沉积作用；成岩作用对改善储层物性及油气的运聚起了重要的作用。砂体的三维模拟结果显示主砂体位于研究区西部，呈西南-东北向展布。储层物性参数的三维模拟也表明优质储层主要分布在主砂体带上长石溶蚀相和绿泥石薄膜胶结成岩相区。  相似文献   

Regional geoelectric structure beneath Deccan Volcanic Province of the Indian subcontinent using magnetotellurics     

T. Harinarayana  B.P.K. Patro  K. Veeraswamy  C. Manoj  K. Naganjaneyulu  D.N. Murthy  G. Virupakshi 《Tectonophysics》2007,445(1-2):66

Understanding deep continental structure and the seismotectonics of Deccan trap covered region has attained greater importance in recent years. For imaging the deep crustal structure, magnetotelluric (MT) investigations have been carried out along three long profiles viz. Guhagarh–Sangole (GS), Sangole–Partur (SP), Edlabad–Khandwa (EK) and one short profile along Nanasi–Mokhad (NM). The results of GS, SP and NM profiles show that the traps lie directly over high resistive basement with thin inter-trappean sediments, where large thickness of sediments, of the order of 1.5–2.0 km, has been delineated along EK profile across Narmada–Son–Lineament zone. The basement is intersected by faults/fractures, which are clearly delineated as narrow steep conducting features at a few locations. The conducting features delineated along SP profile are also seen from the results of aeromagnetic anomalies. Towards the southern part of the profile, these features are spatially correlated with Kurduwadi rift proposed earlier from gravity studies. Apart from the Kurduwadi rift extending to deep crustal levels, the present study indicates additional conductive features in the basement. The variation in the resistivity along GS profile can be attributed to crustal block structure in Koyna region. Similar block structure is also seen along NM profile.Deccan trap thickness, based on various geophysical methods, varies gradually from 1.8 km towards west to 0.3 km towards the east. While this is the general trend, a sharp variation in the thickness of trap is observed near Koyna. The resistivity of the trap is more (150–200 Ω m) towards the west as compared to the east (50–60 Ω m) indicating more compact or denser nature for the basalt towards west. The upper crust is highly resistive (5000–10,000 Ω m), and the lower crust is moderately resistive (500–1000 Ω m). In the present study, seismotectonics of the region is discussed based on the regional geoelectrical structure with lateral variation in the resistivity of the basement and presence of anomalous conductors in the crust.  相似文献   

Origin and anatomy of two different types of mass–transport complexes: A 3D seismic case study from the northern South China Sea margin     

《Marine and Petroleum Geology》2014

Integration of 2D and 3D seismic data from the Qiongdongnan Basin along the northwestern South China Sea margin has enabled the seismic stratigraphy, seismic geomorphology and emplacement mechanisms of eight separate, previously undocumented, mass–transport complexes (MTCs) to be characterized. These eight MTCs can be grouped into two types:(1) Localized detached MTCs, which are confined to submarine canyons and cover hundreds of km², consist of a few tens of km³ remobilized sediments and show long striations at their base. They resulted from small-scale mass-wasting processes induced by regional tectonic events and gravitational instabilities on canyon margins.(2) Regional attached MTCs, which occur within semi-confined or unconfined settings and are distributed roughly perpendicular to the strike of the regional slope. Attached MTCs occupy hundreds to thousands of km² and are composed of tens to hundreds of km³ of remobilized sediments. They contain headwall escarpments, translated blocks, remnant blocks, pressure ridges, and basal striations and cat-claw grooves. They were created by large-scale mass-wasting processes triggered by high sedimentation rates, slope oversteepening by shelf-edge deltas, and seismicity.Our results show that MTCs may act as both lateral and top seals for underlying hydrocarbon reservoirs and could create MTC-related stratigraphic traps that represent potential drilling targets on continental margins, helping to identify MTC-related hydrocarbon traps.  相似文献   

红层“哑地层”划分对比方法——以东营凹陷南坡始新统为例   总被引：1，自引：0，他引：1  

刘书会  高永进  王长轩 《地质论评》2014,60(5):1043-1050

针对红层划分对比所面临的难题,在充分吸收前人研究成果的基础上,将现有的多种分层方法相互整合,彼此约束和印证,形成了一套科学、便捷的技术方法,即"接触关系明顶底、岩电特征找界面、多元融合定方案、地震约束建格架"的综合地层划分对比技术。该方法针对红层的特殊性,根据岩电特征对干旱气候的响应变化,充分利用了测、录井资料纵向上的连续性优势(避免了取样分析的局限),以及地震资料横向上的优势,有效地解决了红层纵向划分、横向对比的难题,在济阳坳陷东营凹陷南坡始新统沙河街组、孔店组的应用取得了良好效果。该方法可为其它地区同类复杂地层划分对比提供技术支持。  相似文献   

来自大别山深成侵入岩图像深度迁移学习的可解释性研究     

陈忠良  袁峰  李晓晖  郑超杰 《地质论评》2023,69(3):2023030017-2023030017

岩石图像识别是以深度学习为代表的感知智能在地质领域的典型应用场景。已有研究显示网络结构简单的深度卷积神经网络能够在岩石图像上取得比复杂网络结构高的分类准确率。这与ImageNet数据集上网络结构越深越好的趋势相悖。如何解释这一现象？深成侵入岩为显晶质,自形—半自形粒状结构,块状构造,其分类的依据是其矿物成分及相对含量。大别山地区岩浆活动广泛,中生代深成侵入岩广泛出露。岩石类型包括超镁铁质岩类、辉长岩类、闪长岩类、正长岩类、二长岩类和花岗岩类,基本覆盖IUGS推荐的深成侵入岩分类方案中的岩石类型。选取大别山地区中生代深成岩图像开展不同网络结构预训练模型迁移学习对比试验,能够专注于深度学习对矿物成分特征的学习解释,降低构造因素的影响。借助局部可理解的模型解释技术和特征图可视化技术,分别从全连接层分类决策区域可视化和卷积隐层可视化两方面对深度学习模型开展可解释性研究。结果表明简单网络结构的卷积神经网络能够提取不同矿物所表现出的颜色特征以及不同矿物组合所表现出的纹理特征。AlexNet模型的削减试验进一步证明：对于岩石图像深度学习,网络结构并不总是越深越好。  相似文献   

西非 Ｒio Muni 盆地复杂盐拱构造油藏特征     

马金苹  胡孝林  郝立华  曹向阳  孙翠娟  张彪 《世界地质》2015,34(3):760-765

为精细解剖西非油气富集的 Ｒio Muni 盆地复杂盐拱构造带上的油藏特征,为其他相似地区油藏评价提供一定参考,以位于复杂盐拱构造带上的 H 油藏为例,利用地震、测井、录井、钻井和 MDT 测试等资料分析 H 油藏的构造、沉积、储层和油层分布特征及成藏主控因素等。研究得出,H 油藏属于典型的构造岩性复合油藏,为构造背景下的岩性边水油藏,具有多套油水系统,构造高部位发育盐刺穿,储层既有浊积砂岩储层又有滑脱灰岩储层,主要分布于构造的翼部低部位,滑脱断层和盐拱是油气成藏的主控因素。  相似文献   

Generating non-stationary random fields of auto-correlated,normally distributed CPT profile by matrix decomposition method     

Reza Jamshidi Chenari  Hassan Kamyab Farahbakhsh 《Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards》2015,9(2):96-108

This paper emphasises the true realisation of Cone Penetration Test (CPT) profiles considering non-stationary nature of the data. Formulation of stationary random field theory has been modified and adapted to non-stationary state in order to take into account the mean and variance variability for soil properties. Multi-variance correlation matrix along with the Cholesky decomposition technique was employed to produce realisations of non-homogenous and non-stationary random fields of CPT profiles. A piecewise and segmental data realisation according to the lithology and site class specifications acquired directly from CPT data is adopted in this study so as to render an accurate data simulation. For validation of proposed method 8 CPT test profiles collected from Urmia Lake site have been introduced and simulated by the stationary and non-stationary algorithms. The mean correlation coefficient between the actual CPT data profiles and related realisations along with some other important statistical parameters and their coefficients of variation strongly demonstrate that non-stationary random field generation technique gives quite better accuracy, by comparison to the conventional stationary random field generation scheme.  相似文献   

A climatic-limnologic model of diatom succession for paleolimnological interpretation of varved sediments at Elk Lake,Minnesota   总被引：1，自引：0，他引：1  

J. Platt Bradbury 《Journal of Paleolimnology》1988,1(2):115-131

Sediment traps placed in the profundal region of Elk Lake, north central Minnesota during the 1979 spring and 1983–84 fall and spring seasons monitored seasonal diatom production for two climatically distinctive periods. The spring of 1979 was one of the coldest and wettest on record. Ice out at Elk Lake was 10 days later than average, and spring circulation was short. Fragilaria crotonensis dominated the late spring and early summer diatom production in association with Synedra and Cyclotella species, perhaps because rates of phosphorus supply were low compared to silica. The winter of 1983–84 was drier than usual, and the early but cold spring of 1984 caused ice out at Elk Lake to be about 1 week earlier than normal. Spring storms promoted a long and full circulation that allowed Stephanodiscus minulutus to bloom, presumably in response to increased phosphorus loading related to deep and vigorous circulation. The two dominant diatoms in Elk Lake, F. crotonensis and S. minutulus may reflect climatic patterns that control lake circulation. The climatically regulated occurrence of these diatoms is generally, but not specifically, comparable to their distribution in lake surface sediments throughout Minnesota. A combination of regional and lake-specific studies on the controls of diatom succession and distribution provides climatic insights for interpreting paleolimnogical records of diatoms.  相似文献   

海拉尔盆地贝尔凹陷布达特群水力破裂的岩石学特征及其成因探讨   总被引：8，自引：2，他引：6  

张新涛  刘立  任延广  邵红梅  马瑞 《世界地质》2004,23(4):343-347

海拉尔盆地贝尔凹陷布达特群凝灰质泥岩中发育大量凝灰质泥岩角砾。岩芯及透射光显微镜观察发现,这是一种水力破裂体系中流体和岩石作用的产物一水压碎屑岩。水压碎屑岩的岩石学特征表现为：角砾之间具有可拼合性、岩芯横切面上发育大量“T”型垂直裂缝、微细纤维状铁白云石脉对壁生长。水力破裂作用的成因主要与布达特群岩性组合特征、构造-流体作用有关。  相似文献   

鄂尔多斯盆地塔然高勒地区直罗组上、下段的岩性-岩相特征及对铀成矿的差异性控制作用     

朱强  李建国  俞礽安  司马献章  文思博  李光耀  司庆红 《地球学报》2019,40(3):456-468

为查明鄂尔多斯盆地塔然高勒地区直罗组上段、下段的岩性-岩相特征以及参与蚀变作用的流体强度差异,开展了系统的岩心观察、剖面对比,并结合黏土矿物、碳氧同位素和U、Th元素等手段进行分析。结果表明,研究区南部直罗组上段主要由灰绿色、红色泥岩夹透镜状红色、黄色、灰绿色砂岩组成,北部主要由红色泥岩与灰绿色砂岩构成,南北部下段均由灰白色、灰绿色砂岩或砂砾岩夹薄层泥岩组成。直罗组红色砂岩为原生沉积,灰绿色砂岩为后生改造类型;上段受含氧含铀水和深部还原性流体作用强度较下段变弱,且由北向南作用程度降低,北部还原蚀变岩石与原生岩石共存,南部基本保留原生岩石;下段则受流体改造更为充分,主体为后生蚀变岩石。直罗组不同类型砂体的展布兼受沉积相和后期流体双重作用,但强弱差异性明显,限制了铀矿化产出在直罗组下段砂体中的定位,因此,上、下段应作为不同的成矿体系讨论。  相似文献