成矿区带深部有色金属矿产资源勘查评价方法技术研究

目前我国大部地区的区域地质、物探和化探测量工作业已完成,确定出数十个成矿远景区带,成矿区带内进一步找矿工作,尤其是深部找矿工作一直是急于解决的主要问题。另一方面,危机矿山找矿问题早已提到议事日程,危机矿山大多处于成矿远景区带内,所以成矿区带找矿也是危机矿山深部和外围找矿的一个组成部分。物化探一直是寻找深部隐伏矿产资源的主要手段,如何把物化探方法技术有机地结合起来,如何将新方法新技术融入到找矿工作中是急需我们考虑的问题。就此问题,文中提出一些看法。     

中国大陆上地幔顶部地震波平均速度分布特征及中新生代陆相盆地成因模式探讨

由中国大陆地震级三维速度图象求取中国大陆上地幔顶部(50—200km深度内)平均速度图,通过它的分布特征分析,结合中国大陆1°×1°平均布格重力异常图,把中国大陆地幔顶部分为5个不同特征的构造域,并探讨了各域内中新生代陆相盆地的成因模式及其动力学原因。     

STUDY ON THE AIR-SEA INTERACTION ON THE INTERANNUAL TIME SCALE IN THE SOUTH CHINA SEA

In this paper we document the correlationship between sea surface temperature (SST) and lowlevel-winds such as sea level wind and 850 hPa wind in the South China Sea (SCS) based onCOADS (1958—1987) and ECMWF objective analysis data (1973—1986).Further statisticalanalyses tell us that there is a fixed SCS basin mode for variations both of SST and low-level windsin the region on the interannual time scale due to air-sea interactions.A simplified,coupled model that is designed following the McCreary and Anderson's (1985)model and includes the feedback between the upper ocean and the circulation of East Asianmonsoon demonstrates an interannual oscillation in the coupled air-sea system,which is similar tothe observations in the SCS.     

SD-1型数字大地电磁记录系统

SD-1型数字大地电磁测深仪是一种用途较广的地球物理勘探仪器,可用于研究地壳上地幔结构,普查石油、天然气田构造,寻找热田及监视地震前地壳电阻率随时间的变化。该仪器已于1982年8月通过国家鉴定。鉴定以后又在华南地区作了大地电磁测深工作。本文只是简述一下仪器的基本结构、几个主要的技术问题及鉴定前后用该仪器所     

黑龙江省虎林市幅重磁场特征及其地质解释

以区域地质资料和物性资料为依据，对黑龙江省虎林市幅重磁场特征进行了综合分析。根据航磁△T异常以及布格异常平面等值线展布特点，对该区的杂乱磁场区、线性磁场区和平稳磁场区进行了相关的地质解释，描述了30条断裂构造带及其重力场特征；结合重力异常和航磁异常等综合资料，按结晶基底起伏形态，将虎林盆地划分为4个隆起、3个凹陷共7个构造单元。     

Ophiolites from the Mianlue Suture in the Southern Qinling and Their Relationship with the Eastern Paleotethys Evolution

The Mianlue suture extends from Derni-Nanping-Pipasi-Kangxian to the Lueyang-Mianxian area, then traverses the Bashan arcuate structure eastward to the Huashan region, and finally to the Qingshuihe area of the southern Dabie Mountains. From east to west, with a length of over 1500 km, the ophiolitic melange associations are distributed discontinuously along the suture. The rock assemblages include ophiolite, island-arc and oceanic island rock series, indicating that there existed a suture zone and a vanished paleo-ocean basin. The Mianliie paleo-ocean basin experienced its main expansion and formation process during the Carboniferous-Permian and closed totally in the Triassic. It belongs to the northern branch of the eastern paleotethys, separated from the northern margin of the Yangtze block under the paleotethys mantle dynamic system.     

从地震信息看中国东部垂直构造样式及油气

所讨论的垂直构造是石油勘探中最常见的小尺度局部升降作用所引起的各种构造 ,按成因可分为跨塌构造、压实构造、底辟构造三类样式。垮塌构造样式是碎屑岩沉积盆地基底的碳酸盐岩地层长期被地下水溶解形成地下大溶洞 ,造成上部地层垮塌而形成的堑背形构造样式 ;压实构造由沉积压实作用所致 ,可分为基底古隆起披覆构造样式和差异压实披覆构造样式等 ;底辟构造 (又称“挤入构造”)是塑性岩层在外力作用下发生底辟作用而产生的 ,分刺穿底辟和拱形底辟两种 ,或冷底辟和热底辟两类。莺歌海盆地发育众多的地震异常体 ,呈底辟状 ,但比较特殊 ,可称为气烟筒 ,与通常的底辟具本质之别。中国东部中、新生代盆地中普遍发育垂直构造 ,它们与沉积作用同步发生 ,一般无明显的挤压褶皱变形     

低产低渗裂缝油田吞吐采油试验研究

头台油田是构造—岩性油藏。裂缝型、特低渗透是其显著特点，常规注水开发后经常出现严重的油井水淹，造成油田开发低效。本文以头台油田研究为例，认为对于裂缝型特低渗透油田，采用注水吞吐采油技术，通过套管直接向地层注水，利用储层毛管力作用，进行油水置换，实现单井自注自采吞吐采油，可以改善油田开发效果，减缓产量递减。适合注水吞吐采油基本条件是岩石润湿性为弱亲水和岩石饱和非润湿相。影响注水吞吐采油效果的主要因素是储层吸水状况、微缝发育状况、储层非均质性、注入体积和关井压力等。吞吐采油技术可作为改善裂缝型特低渗透油藏开发效果的一种新的模式来研究和推广。     

Cenozoic Adakite-type Volcanic Rocks in Qiangtang, Tibet and Its Significance

Volcanic rocks in the study area, including dacite, trachyandesite and mugearite, belong to the intermediate-acid, high-K calc-alkaline series, and possess the characteristics of adakite. The geochemistry of the rocks shows that the rocks are characterized by SiO2>59%, enrichment in A12O3(15.09-15.64%) and Na2O (>3.6%), high Sr (649-885 μg/g) and Sc, low Y contents (<17 μg/g), depletion in HREE (Yb<1.22 μg/g), (La/Yb)N>25, Sr/Y>40, MgO<3% (Mg<0.35), weak Eu anomaly (Eu/Eu=0.84-0.94), and lack of the high field strength elements (HFSE) (Nb, Ta, Ti, etc.). The Nd and Sr isotope data (87Sr/86Sr=0.7062-0.7079, 143Nd/144Nd=0.51166-0.51253, εNd= -18.61-0.02), show that the magma resulted from partial melting (10%-40%) of newly underplated basaltic lower crust under high pressure (1-4 GPa), and the petrogenesis is obviously affected by the crust's assimilation and fractional crystallization (AFC). This research will give an insight into the uplift mechanism of the Tibetan plateau.