川中古隆起北斜坡岩溶储层岩电分析及气层识别

四川盆地川中古隆起北斜坡震旦系是受岩溶控制的巨厚白云岩油气藏,气水关系十分复杂,储层呈基质孔隙度低、次生溶蚀孔洞发育特征,而且储层类型多样,致使储层岩电关系存在非Archie现象,同时储层的非均质性和地层水矿化度的差异掩盖了气水的测井响应特征,造成测井气水识别难度大。为此,通过对不同类型全直径岩电参数、声学特性实验数据和地层水资料的综合分析,优选了饱和度模型参数,建立了含水饱和度计算电阻率—实测电阻率重叠判别法、基质电阻率—实测电阻率重叠判别法、理论计算纵横波速度比—实测纵横波速度比重叠判别法3种以声波、电阻率相结合的测井气层识别方案。应用该技术对川中古隆起北斜坡震旦系灯影组储层进行解释,符合率达到93.1%。

红河油田地层水类型及分布规律探讨

通过对鄂尔多斯盆地红河油田主要层位地层水离子成分及矿化度分析,探讨了地层水类型和分布规律,地层水化学组成主要以K+、Na+、Cl-离子为主,延安组多为Na2SO4水型,部分为NaHCO3水型,三叠系延长组主体为CaCl2型,部分为MgCl2型,纵向上地层水的矿化度不随深度增加而增加,平面上矿化度呈分区性特点。

塔里木探区地层油、气、水组成特点

对原油、天然气、地层水分析可以为石油勘探工作者提供第一性分析资料。文中简述了塔里木地区地层水基本化学特征;部分地区天然气的组成特点以及原油特点。

液相色谱分析技术在录井中的应用探讨

为探讨液相色谱分析技术在录井中的应用,介绍了液相色谱仪工作原理、结构组成、性能指标,讨论了液相色谱分析技术用于岩屑录井、岩心录井以及地层水分析中的可行性及优势。对液相色谱分析技术在台北凹陷轻质油识别、川东北元坝地区地层水分析中的应用表明,液相色谱分析技术具有分析速度快、分离效率高、检测灵敏度高的特点,据此提出在录井作业中进一步推广该技术,以期大幅提高录井精度、扩宽录井手段和不断提升录井水平。

和田河气田奥陶系碳酸盐岩气藏类型再认识及其意义

和田河气田是在塔里木盆地发现和探明的第一个古生界碳酸盐岩大气田,但围绕其周缘钻探的一系列局部构造相继失利,迫切需要对其气藏类型重新进行认识。为此,通过分析该区地层水、天然气及储层特征,发现大多出水井段为非地层水或少量局部封存水,无大面积的块状底水;天然气性质在纵、横向上有变化,具有明显不均一性;古潜山储层不受现今构造高程控制,非均质性强,横向变化大,连通性差,以相对孤立的缝洞体储层为主。气藏模式分析结果表明:该区奥陶系气藏为沿古潜山顶面分布、受缝洞体储层控制的非构造型气藏,是和田河气田周缘奥陶系勘探的主攻类型,南部的麦盖提斜坡区发育奥陶系风化壳岩溶储层,是寻找大面积非构造油气藏的有利方向。

Risk assessment study on bridge foundation in deep overlying stratum

Based on the analysis about the hydrogeological conditions and engineering geological conditions, this paper makes analysis on the possible risks of the deep overlying stratum foundation and establishes the risk evaluation index system during the foundation operating period. Such methods as analytic hierarchy process （AHP） , Delphi method and fuzzy comprehensive evaluation method are adopted to make the quantitative analysis on the risk factors and establish the risk judgment model. According to the actual engineering of Taizhou Bridge, the paper evaluates the risk of the foundation during the operating period at the condition of deep overlying stratum. The evaluation results can provide the reference for the risk management of the bridge foundation durin~ the ooerating period.

Assessment of Diyarbaklr Basalt Aquifer Hydrogeological Analyzed and Obtains Thematic Maps with GIS Geostatistical Analyst Tool

Diyarbaklr basalt aquifer is volcanic-rock aquifers which contain high quality water. It was main resources for Diyarbaklr city center drinking supply up to 2005. Somewhere, basalt aquifer groundwater is still used for irrigation in rural areas of Diyarbaklr city. In the study, Diyarbaklr city center＇s （which is located on the Tigris river basin） basalt aquifer groundwater potentials and hydrogeological features are examined and modeled by using GIS programmer. Firstly, general geological data, meteorological data and general information about natural water sources are collected together, afterwards, logs of well drilled by public institutions and private individuals within the Diyarbaklr city center are analyzed. Static water level, dynamic water level and well pumps yields are classified in these logs. Then, thematic maps produced with the help of Arc Info Professional GIS programmer with geostatistical analyst tool. Groundwater source potential of Diyarbaktr is examined by means of these thematic maps. In hydrogeological research, productivity by aquifer features, water retention capacity and groundwater level data evaluated with geological structure of area are taken into consideration.

Multi-wave forward modeling of a reservoir and AVO analysis

In the process of accurate interpretation of multi-wave seismic data,we wanted to solve the problem of multi-wave information recognition.Based on techniques of elastic wave forwarding,targeting the geological model of a reservoir of an oil field exploration area,we used a high-order staggered-grid difference technology to simulate many shots of seismic records of nonzero offset shots,implemented multi-wave seismic data processing to acquire the CMP of P waves and converted waves,NMO traces of CCP pre stacks,including AVA information and superposition profiles.Based on the AVA calculation of the model,the layer parameters of the model and the forwarding wave field relations of the P-S wave,we also compared and studied the correspondence between P waves and converted waves.The results of our analysis show that the results from simulation and from the AVO analysis are consistent.Significant wave field differences between P waves and converted waves in the same reservoir were found,which are helpful in recognizing and interpreting the multi-wave information in this area.We made use of the multi-wave data to provide the important guidelines for reservoir prediction.

Computation model of proppant embedment depth based on dimensional analysis

Hydraulic fracturing is designed to form a high-conductivity fracture. The proppant will embed into the formation rock, especially in soft rock, owing to the interaction between proppant and fracture surface after fracture closure. Proppant embedment would reduce the fracture width and then lower the fracture conductivity. According to dimensional analysis, the rock is assumed to be an elastic material. Using the theory of elasticity to describe the stage of elastic deformation and analysis of the corresponding simplified embedding process, the study establish the static computation model of the two-dimensional infinite half plane and three-dimensional infinite half space model of the proppant embedment. According to laboratory results, the calculation model was modified, got an effective correction factor and analyzed the causes of errors, then discussed the factors which have impact on proppant embedment. The result calculated by the model in this paper can be reference of prop- pant optimization in on-site fracturing for a certainty degree.

乌伦古坳陷滴北构造滴北1号断层封闭性研究

通过对断层的泥岩涂抹系数、断面压力和断移地层泥岩含量的分析可以研究断层的侧向封闭性和纵向封闭性。在对卡拉萨依及滴北1号断层构造发育特征研究的基础上,通过对黄山街组-头屯河组泥岩涂抹系数进行分析,认为其侧向封闭性好;通过对断面垂向正压力和断层两侧断层泥质分析,确定断层垂向封闭性好。综合分析卡拉萨依及滴北1号断层为封闭性断层,通过地层水分析进一步证明了该结论。