银额盆地查干断陷闭流湖盆层序类型与层序地层模式

目前,对断陷畅流湖盆的层序地层模式研究较多,而针对断陷闭流湖盆的层序地层模式研究较少。以查干早白垩世断陷闭流湖盆为例,分析了断陷闭流湖盆的沉积特征和演化规律,总结了断陷闭流湖盆的层序类型及特征,提出了断陷气候复合型和气候型层序类型,归纳了不同演化阶段的层序地层模式。认为查干断陷闭流湖盆沉积演化经历了断初、断陷和断坳等3个阶段,断初和断陷阶段的层序地层模式是一种由断陷气候复合型层序组成的层序地层模式,断坳阶段的层序地层模式是由气候型层序组成的层序地层模式。     

湖北省随州市南部“古城畈群”的再研究

本文依据原古城畈群中采集到的牙形石化石,建立了两个地层单位,即立秋湾组和高家湾组。前者主要由原古城畈群下部的泥质板岩、变玄武岩和少量灰岩透镜体组成,含少量常见于寒武纪的介形类化石,时代归属中—上寒武世,后者之上部是泥质岩和火山岩;下部是条纹状灰岩,灰岩中产出牙形石,计有18属26种。如:Paroistodus cf.numarcuasus,P.proteus, Paltodus cf.deltifer,Triangulodus proteus,Acodus cf.deltodus,Drepanodus arcu-atus等。这些化石可与宜昌地区红花园下部及分乡组上部的牙形石化石带对比。相当于北大西洋生物分区阿仑尼格阶下部的Paroistodus带和特马豆克阶上部的Paltodus deltifer带。其时代归属于奥陶纪。     

An analytical technique for uni,bi, and trimodal paleocurrent data

Accurate paleogeographic reconstructions of sedimentary rock associations require a method of paleocurrent analysis in which each individual current system present can be analyzed separately. Such a method has been developed whereby mixtures of up to three populations in any one paleocurrent distribution can be analyzed individually. For each population the mean direction (u_i), concentration about the mean (k_i), and proportion of that population in the entire distribution (p_i) are determined from the data, along with a chi-square, goodness-of-fit test of the model selected.     

The effect of sedimentary microfacies on wettability of tight sandstone in coal-bearing strata: a case from Ordos Basin,China

Abstract

With the advancement of mining and exploration technology, tight sandstone gas reservoirs in coal-bearing strata have greatly attracted people's attention. As a surface property of tight sandstone, wettability is critical in gas recovering process. The sedimentary microfacies indirectly affect the sandstone wettability by controlling its composition and structure. It was found that in general, the sandstone samples deposited in sedimentary microfacies with a strong hydrodynamic force, such as subaqueous distributary channel, the barrier bar and sand flat are strongly-moderately water wet with higher gas content and higher expected gas recovery, while the sandstone samples deposited in sedimentary microfacies with weak hydrodynamic force or high interstitial contents are usually weakly water wet with lower gas content and lower expected gas recovery.     

“三相”联合解释技术在岩性油气藏勘探中的应用—以吐哈盆地胜北地区为例

采用测井相、地震相、沉积相“三相”联合解释技术进行吐鲁番－哈密盆地胜北地区岩性油 气藏纵向有利勘探层系和平面有利勘探位置优选,其中用测井相与岩芯观察结合确定主要勘 探目的层井点处的沉积微相类型,用地震相分析确定目的层平面地震相变化特征,用单井等 建立的纵向沉积微相组合模式和平面沉积微相变化规律来全面确定目的层沉积微相变化特征 ,直接指导岩性油气藏有利勘探层系和平面位置的选择。通过在胜北地区喀拉扎组的应用, 确定了胜北构造带及其南翼喀拉扎组冲积扇扇中辫流河道为岩性油气藏有利勘探区带和层系 ,优选的目标胜北16井在实际勘探中取得了良好效果,评价出北部辫流河道东段和南部辫流 河道为下一步的有利勘探地区。认为“三相”联合解释技术在地震资料品质较好、构造相对 简单且具备一定勘探程度的地区具有良好实用性。     

磺厂坪黄铁矿矿床地质特征及成因初探

本文介绍了川东—鄂西与毗邻地区二叠系上统吴家坪组黄铁矿床的特征、分布规律;阐述了成矿与海湾三角洲相有关;矿质主要来源于火山活动。探索了成因,提出了矿床成因类型属于中基性火山岩有关的沉积-成岩矿床     

黄石下陆-西塞山地区早三叠世地层沉积特征及层控矿床找矿方向探讨

本概述了黄石下陆-西塞山地区早三叠世地层的沉积特征，通过分析其沉积环境，归纳区内T1dy^4-T1—2j^1角砾岩层与铅、锌、银矿床的成因联系，铅、锌、银矿化体与断裂的关系，从而总结区内的找矿方向。     

川西坳陷丰谷构造须四段沉积微相及沉积演化

川西坳陷丰谷构造须家河组四段属典型的陆相含煤地层,广泛发育辫状河三角洲沉积.首先根据岩心描述、岩石薄片观察及砂体测井曲线形态分析等,在须四段识别出水下分流河道、分流河道间、河口坝、远砂坝、水下天然堤和前三角洲泥等6种沉积微相;其次针对丰谷构造井资料较少、砂泥岩速度差异不大的特点,采用神经网络的地震多属性反演得到自然伽马...     

车西洼陷沙四上亚段特低渗储层物性主控因素分析

车西洼陷沙四上亚段碎屑岩储层以含泥细砂岩为主,孔隙度多集中在10%～20%,渗透率多小于10×10-3μm2,结合铸体薄片、压汞、地化测试分析等综合评价为中-低孔特低渗较差储层.研究表明,该区储层物性主要受沉积、成岩和异常高压3种因素控制:1)沉积微相主控储层砂体空问展布形态及孔陈度分布特征;2)成岩作用主控储层砂体孔...     

志丹油田长2段沉积微相特征及其控油规律

根据岩心观察和薄片鉴定结果,以及测并资料和粒度分析,并综合前人研究成果,明确指出志丹油田长2油层组为三角洲沉积,主要的沉积微相类型包括分流河道微相、天然堤微相、沼泽微相、决口扇微相和河漫滩微相.其中,分流河道微相和天然堤微相是主要的油气富集相带,长2油层由下而上的沉积具有一定的继承性;沉积相对长2油层下段的油藏分布起主...