Reliability-Based Load and Resistance Factors Design for Offshore Jacket Platforms in the Bohai Bay： Calibration on Design Factors

For the fulfillment of the probability-based structural design for the offshore jacket platforms in the Bohai Bay, the design factors of loads, resistance and load combinations are much necessary to be calibrated according to the proposed target reliability index. Firstly, the limit states function for the offshore jacket platforms is introduced. Then, four approaches to calibrate the factors of load and resistance are presented and compared. Afterwards, the methods to calibrate the load combination factors...     

江西金溪熊家山钼矿床特征及其Re-Os年龄

位于武夷隆起带西坡的江西熊家山钼矿床具有独特的矿化特点。本文概要地介绍了该钼矿的矿床地质特征,通过对辉钼矿的Re-Os同位素组成的测试分析,获得模式年龄151.7~161.6Ma,并计算出等时线年龄为152±20Ma,钼矿成矿作用发生于燕山早期。通过与我国大量的与岩浆作用有关的铜铅锌银多金属矿床辉钼矿Re含量的对比分析,揭示出熊家山钼矿成矿物质来源于上地壳,成矿构造背景归属于武夷隆起成矿带而不是赣东北构造成矿带。     

地震动促进石油运移的一种模式及其发生边界

天然和人工地震动使地下孔隙流体瞬时产生相对于地层介质的加速运动趋势,即产生了作用于流体的瞬时冲力。在不考虑质量扩散力条件下,本文以岩石孔喉结构理想模型和充填其中的石油受力分析为基础,对水平、垂向两地震动作用方向上,促进石油运移时的油柱长度、孔隙、喉道等边界条件进行了分析,并考虑了静水常压和异常压力两种地层状态下的情况。研究表明,在无裂缝作为运移通道的条件下,地震动作用可以使油柱在岩石破裂前,突破一定岩石孔隙结构的喉道发生运移。对该地震动促进石油运移模式的边界条件分析认为,小孔喉比值、大半径孔隙和连续一定长度的油柱利于油柱突破喉道运移的发生,油柱在水平向地震动作用于静水常压地层、垂向地震动作用于静水常压地层、水平向地震动作用于低过剩压力梯度地层、垂向地震动作用于高过剩压力梯度地层等4种情况下,地震动促使运移发生的难度依次降低。     

Affinity between Palaeozoic Blocks of Xinjiang and Their Suturing Ages

The Kazakhstanian plate was near the Tarim, Sino-Korean and South China-Southeast Asian plates in the Middle-Late Cambrian and Late Ordovician, and approached the Siberian plate in the other periods of the Early Palaeozoic. The Hi and Toksun-Yamansu terranes had been split from the Tarim plate before the Middle Devonian and then went close to Angaraland in the late Early Permian. The Beishan area on the northeastern margin of the Tarim plate came close to Angaraland first in the early Early Permian. The suturing age between the Tarim and Ka-zakhstanian-Siberian plates is generally the same as that between the Turkey-Central Iran-Gangdise and South China-Southeast Asian plates. The suturing event took place in the early Early Permian, while the corresponding tectogeny occurred between the Early and Late Permian.     

嘉荫盆地太平林场组巴尔姆孢（Balmeisporites）的发现及其意义

2001年在嘉荫盆地太平林场组暗色泥岩中,发现油气显示,是大庆油田外围探区中第二个重点勘探的盆地。本次工作在太平林场组的建组剖面下部泥岩中首次发现丰富的大孢子化石—巴尔姆孢(Balmeisporites),见有3个种和2个未定种,其中新种2个,它们是:康氏巴尔姆孢(比较种)Balmeisporites cf.kondinskayae Srivastava et Binda、嘉荫巴尔姆孢(新种)Balmeisporites jiayinensis sp.nov.、太平林场巴尔姆孢(新种)Balmeisporites taipinglinchangensis sp.nov.、巴尔姆孢?(未定种 1)Balmeisporites?sp.1、巴尔姆孢?(未定种 2)Balmeisporites?sp.2。这一发现丰富了太平林场组建组剖面的生物化石内容,对嘉荫盆地井下岩石地层单元与露头剖面的对比提供了重要依据,所发现的巴尔姆孢均是不具赤道突起的类型,反映出典型晚白垩世的特征,本组产出的孢粉、介形类和叶肢介化石可与松辽盆地嫩江组对比,为晚白垩世桑顿期-坎潘期。巴尔姆孢指示的古气候应为潮湿的亚热带气候,产巴尔姆孢的层位所处的古环境应是河流入湖处的三角洲前缘或前三角洲的部位。