The study on genesis of dolomitization in different parts of oolites plays an important role in revealing the forming process and diagenetic evolution. Based on the field section observation and sampling for the second member of Lower Triassic Feixianguan Formation in the Shangba section of Yunyang, Chongqing, the location, degree and genesis of oolite dolomitization were analyzed by using thin section, cathodoluminescence, inclusions, C/O stable isotopes, and trace elements. The research results are as follows:（1）The dolomitized oolites include complete and incomplete ones, and the latter can be subdivided into outershell-dolomitized oolites,core-dolomitized oolites, and outershell-core-dolomitized oolites.（2） In layers 1–7 of the Shangba section, there develops completely dolomitized oolites, core-dolomitized oolites and outershell-dolomitized oolites. The internal dolomites are characterized by low contents of Mn, Fe and Sr, low δ 13 C and δ 18 O, and weak to very weak maroon cathodoluminescence, while intergranular calcites are nonluminous, indicating that the dolomitization occurred in the penecontemporaneous period, dominated by infiltration and reflux.（3） The core-dolomitized oolites in layer 4 are characterized by abnormally low Mn and Fe contents, high Sr, low δ 13 C and δ 18 O, deformation and fragmentation, and increased content of intergranular mud, indicating that the thermal expansion in the exposed environment gave rise to the fragmented oolites.（4） The dolomites in completely dolomitized oolites in layers 8–12 show relatively high Fe and Mn, relatively low Sr, enlarged bright edges, high internal inclusion temperature（90℃–120℃ and 130℃–140℃）, negative biases of δ 13 C and δ 18 O, and filling of intergranular dolomites, indicating that the dolomites were strongly buried dolomitized.（5） Both completely and incompletely dolomitized oolites were dolomitized in the penecontemporaneous period. However, they are different in the material basis before the dolomitization, the former experienced aragonitic homogenization cementation due to the early progressive cementation,resulting in uniform dolomitization; the latter experienced aragonitic and calcite cementation under the joint effects of progressive cementation and penecontemporaneous freshwater leaching, and then was formed by dolomitization along the aragonitic cements.

Cracked limestones are common in the Upper Ordovician Pagoda Formation of the Yangtze Plate. Previous studies have focused on the origin of the cracks. However, in the seemingly single structure, the existence of limestone, the temporal-spatial differentiations in rock and lithofacies types, structure and texture, and palaeobios remain uncertain. Therefore,based on the previous studies,and guided by the theories of sedimentology, paleontology and geochemistry, the morphological structure of plane and vertical plane were analyzed. The results show that（1） the cracks can be divided into five shapes: brain striate, wave, fish scale, grid and lens; and six types of lithofacies are concluded; the various crack structures are different in lithology, paleontology and sedimentary environment;（2） the cracked limestones with different types are mainly controlled by sedimentary environment and shale content; the formation of the cracks is controlled by diagenesis, tectonism, and deposition rate, etc.; and（3） on this basis, a comprehensive development model of cracks under gentle slope setting is established depending on different rock types, paleontological assemblages, hydrodynamic conditions, shale content, redox conditions and palaeosalinity; it is indicated that, from shallow water to deep water, there develops crack shapes in brain striate, wave, fish scale, grid, and lens.

为探究川西北地区天井山古隆起固体沥青地球化学特征、成因和来源及其地质意义,采集研究区寒武系、泥盆系和二叠系20块野外露头沥青样品,通过固体沥青族组成、生物标志化学物、碳同位素等分析测试,结合构造演化史,建立研究区沥青动态演化形成模式.结果表明:天井山古隆起固体沥青是古油藏遭受严重生物降解而形成的,寒武系和泥盆系沥青来源于筇竹寺组烃源岩,二叠系沥青来源于筇竹寺组和二叠系烃源岩的混合.天井山古隆起经历大面积古油藏聚集,沥青封堵保存条件较好的翼部是古油藏的有利勘探目标.该结果为川西北地区天井山构造勘探与开发提供指导,也为类似的构造演化复杂地区沥青形成与油气演化研究提供借鉴.

四川盆地中部高磨地区震旦系灯影组台缘带勘探成效显著,但台内钻探以中—低产为主,亟待攻关有利区带预测办法.以野外露头、岩心、测井和地震资料为研究基础,利用测井数据建立灯影组可容纳空间模型,可间接反映古海平面升降规律,并以此作为地震层序划分的主要依据,建立高分辨率层序地层格架,分析沉积横向上的沉积趋势,发现台内"隐蔽"的有利相带.结果表明:①灯影组发育2个二级层序,4个三级层序;②首次发现灯二期及灯四期内各发育1次区域性海退,即灯影期共有4次区域性海退,而非前期认为的2次海退;③4期海退在高磨地区形成了4期台缘带.结论认为:由于新发现的灯二早期及灯四早期台缘带尚未有钻探证实,台内多期台缘带应是下一步风险勘探的重要方向.

通过对集团公司境内油气合作项目的联合账簿审计,本文发现在国际大石油公司作为合作伙伴、带来先进技术和管理理念的同时,还引发了项目机构设置、人员管理方面的一些问题,如:组织机构庞大、中外方同工不同酬、外籍员工薪酬标准过高、人员隐性化管理等.本文将对问题的成因、现状以及促进企业管理提升的解决措施进行探讨.

四川盆地在川中、蜀南地区下寒武统沧浪铺组均钻遇过白云岩,但盆地内其他地区尚未见钻遇白云岩的公开报道.2018年初,中国石油在达州—开江地区部署的风险探井五探1井首次在川东地区下寒武统沧浪铺组钻遇厚层块状白云岩.基于此,通过野外地质调查、钻井及地震资料的综合分析,对沧浪铺组地层、岩性的展布特征及控制因素进行了分析.认为:①在沧浪铺期,德阳—安岳台内裂陷仍未填平,该裂陷对沧浪铺组地层及岩性具有重要的控制作用;②白云岩主要分布在古隆起区或古隆起围斜区的高部位,裂陷区内不发育;③在川中磨溪—川西九龙山地区,发育沧浪铺组颗粒白云岩与加里东古侵蚀面的叠合区,颗粒白云岩遭受顺层溶蚀改造,有利于形成沧浪铺组层控型白云岩储层;④沧浪铺组白云岩储层紧邻下伏筇竹寺组烃源岩,上覆良好的盖层,具备形成良好成藏组合的条件,可作为四川盆地海相碳酸盐岩天然气勘探的新领域.

Combined with engineering practice,the corrosion theory of metal pipe in the soil was discussed, and effect of high-voltage wiring AC on pipeline corrosion was investigated. The results show that, when the distance between the high voltage line and the pipe is above 1 000 m, effect of the AC on the pipeline corrosion need not be considered;AC power density can be divided into three determining strength including weak, medium and strong. When AC power density is strong, the corrosion protection measures must be taken."Negative potential ground"is an effective method for corrosion protection of the pipelines.

脉冲试井是井组(至少2口井)间开展的一种试井技术,其测试的难度远高于常规、稳定或不稳定试井。进行脉冲试井能检验井间是否连通、检验井间断层是否密封、求取不同方向的渗透率、对于裂缝性地层或水力压裂地层,可大致确定裂缝的走向、评价工艺措施后的效果。以ZZ油田Z70-X断块为例,利用脉冲试井对其井间连通性进行了分析。