Major factors controllin8 the formation of middle and large marine carbonate stratigraphic fields

Marine carbonate oil and gas fields have become an important exploration area in China and even across the world. Their formation, distribution and enrichment are special owing to the complexity of the deposition, diagenesis and accumulation, which is caused by the multiplicity of the carbonate de- positional environments and facies, huge extensions of formation time and burial depth, complication of diagenetic evolution, heterogeneity as well as the development of pores, caves and fractures affected by various factors. Oil and gas accumulations in carbonate rocks are not strictly controlled by the second-order structure belt. Most of them, under certain structural settings, are controlled by sedimentary diagenesis and its favorable facies. The hydrocarbon reservoir type is predominantly stratigraphic. Based on the worldwide researches of carbonate fields, the paper concludes that 7 main factors control the formation and distribution of middle-large marine carbonate stratigraphic fields.     

利用随机引物对PCR反应条件的筛选及优化试验

不同试验PCR反应的条件是不完全一致的，在PCR反应进行前就有必要对反应条件进行筛选和优化，因此，提出了对关键实验条件的正交筛选，结合反应的增强与抑制条件，从而筛选出适用于本实验室的最佳反应条件。     

安全管理激励机制与安全去激励因素探讨

事故灾害一直是制约煤炭企业发展的突出问题 ,安全管理激励机制的科学、合理与否与安全生产水平息息相关。基于现代激励理论本文研究分析了安全激励机制 ,首次提出并论述了煤矿安全去激励因素 ,这有助于深化对事故防御及安全管理与监察的理解 ,有助于推动煤矿安全管理的现代化 ,提高煤矿安全生产水平。     

龙海西边综合养殖系统主要环境因子的变化

1999年9月至2000年7月，用海水分析方法每月检测龙海西边综合养殖系统9个水质理化因子和2个沉积物指标，结果表明水质指标变化范围是：水温12－31℃、盐度1．84－19．61、透明度20－70cm、pH值7．32－10．14、氨氮（NH4^ -N NH3-N)0-0.080mg/dm^3、亚硝酸氮（NO2^--N)0-0.033mg/dm^3、硝酸氮（NO3^--N)0-0.271mg/dm^3、磷酸盐（PO4^3--P)0-0.010mg/dm^3、化学需氧量（CODMn)1.91-10.63mg/dm^3；沉积物中硫化物（S^2-)和有机质的变化范围分别是72.06-684.77mg/kg和1.21%-5.87%。该综合养殖系统底质污染较严重，养殖效益不显著。     

陕西紫阳-岚皋一带地质灾害特征及防治对策

紫阳、岚皋一带是陕南山地地质灾害的高发区和重灾区 ,随着各种工程经济活动的增强 ,灾害发生更加频繁 ,危害性更大。作者在分析区内地质环境的基础上 ,系统总结了地质灾害的类型、发育特征、分布规律和控制因素等特征 ,进而提出了防治对策建议     

学报质量的影响因素及其对策

高校学报质量是学报工作的永恒话题。它对促进高校的总体发展 ,提高科研水平 ,培养教师队伍具有重要作用。为了满足高校的不断发展对学报工作的需要 ,以《西安科技学院学报》为例 ,对学报质量的影响因素进行了全面的分析 ,并在此基础上提出了相应的对策。对提高高校学报质量具有普遍的意义     

公路交通冲突及影响交通冲突危险性因素分析

以路段交通冲突概念为基础，对非严重交通冲突与严重交通冲突的判别基点及交通冲突发生时碰撞能量进行了讨论，分析了影响交通冲突危险性的主要因素。     

湖北省城市化水平影响因素探讨

把湖北省近15年的城市化发展分为两个时期，从人口、社会经济、地理环境等角度选取具有代表性的指标对城市化水平作相关分析，结果显示湖北省城市化水平总体上和社会经济发展水平密切相关，但不同时段影响城市化水平的主要因素是不同的，在1994年以前9年内，工业化是影响城市化水平的主要因素；在1995年后，第三产业和乡镇工业化对城市化水平影响显。     

平面V形切口双应力强度因子的光弹性实验研究

文章在分析具有双重应力奇异性平面 V形切口尖端应力场的基础上 ,提出了基于由光弹性实验获得的等差线确定与双重应力奇异性对应的双应力强度因子 K1 、K2 的光弹性实验方法 ,并通过对模型的光弹性实验 ,运用该方法较好地确定了均质材料 60°单应力奇异性 V型对称切口模型和均质材料 45°双重应力奇异性 V型非对称切口模型的应力强度因子 ,验证了该文中提出的方法的正确性     

Control factors and porosity evolution of high-quality sandstone reservoirs of Kela-2 gas field in Kuqa Depression

By using the integrated methods includingsandbodies modelling of the outcrops, sedimentary facies ofthe cores and well logs of the drilled wells, and the reservoircorrelation of interwells, it is thought that the sandstone res-ervoirs of Kela-2 gas field are a suit of high-quality naturalgas reservoirs with great thickness, extensive and continuousdistribution, high porosity and permeability, and a few bar-rier beds. Sedimentary facies and microfacies are the mainfactors controlling the reservoir distribution and interiorheterogeneity. Based on a great deal of data of rock's thinsections, porosity, permeability, and the parameters of capil-lary pressure, the reservoir diagenesis, controls, mechanismand evolution of pores have been studied. It is consideredthat compaction in the early stage and diagenetic dolomiteand calcite cements have effect on the decline of reservoirsproperty. Now compaction is chiefly middle to weak. Thebetter reservoirs have no or a few calcite cements. In theearly of deep buried stage, there are still mainly remainderprimary intergranular pores. The authigenic kaolinite ofreservoirs is the production of the dissolution of feldsparsand lithic fragments. The dissolution results in the partlymodified and broadened secondary intergranular pores. Inthe late of deep buried stage, structure fissures and over-pressure were in favor of improving and preservation ofthese pores.