Determing Gas Content Stratigraphics in ODP Cores by Monitoring Variations in Temperature, Pressure, and Conductivities During Core Recovery

99-10418Paull推荐的项目将开发和部署仪器，在岩心回收过程中，在标准的大洋钻探计划(ODP)标准高级活塞岩芯(APQ岩芯桶)内测量温度、压力和电导率随时间的变化。这些仪器将由传感器和数据记录器组成，这些数据记录器安装在专门建造的岩心桶中。它们将记录在回收过程中岩心中游离气的发展，导致岩心温度异常(冷却)和电导率下降。结合压力数据对电导率和温度随时间的变化进行评估，将有助于定性估计甲烷水合物的丰度，确定游离气是否是甲烷水合物破裂的结果，并随后从地层学上确定取心区段中甲烷水合物的存在和稳定性。将建造五台仪器，蒙特利湾水族馆研究所(MBARI)开发和建造传感器包，开发和建造数据记录包以及ODP科学操作员(德克萨斯A&A；M大学)的总体组装，MBARL进行初步遥控运载器(ROV)测试，其中三个系统将及时部署在JOIDES决议上，以便在2001年进行预期的天然气水合物钻探，一个将由MBARI ROV部署，一个将留在MBARI用作故障排除参考。这些仪器将极大地提高我们估计甲烷水合物稳定性、产生量和体积的能力，从而扩大我国估计甲烷能量储量和海平面下降(随后释放温室气体甲烷)可能的气候影响的能力。

99-10418PaullThe recommended project will develop and deploy instruments that will measure temperature, pressure, and electrical conductivity with time within a standard Ocean Drilling Program (ODP) standard Advanced Piston Core (APQ core barrel during core recovery. The instruments will consist of sensors and a data logger within specially constructed core barrels. They will record the development of free gas in core during recovery, resulting in core temperature anomalies (cooling) and a decrease in electrical conductivity. Evaluation of conductivity and temperature with time, when combined with pressure data, will allow qualitative estimation of abundance of methane hydrate, determination of whether the free gas is resulting from methane hydrate breakdown, and subsequent stratigraphic determination of methane hydrate presence and stability in the cored section. Five instruments will be built, with development and building of the sensor package at the Monterey Bay Aquarium Research Institute (MBARI), development and building of the data recording package as well as overall assembly at the ODP Science Operator (Texas A&M University), and initial remotely-operated vehicle (ROV) testing by MBARL Three of these systems will be deployed on board the JOIDES Resolution in time for anticipated gas hydrate drilling in 2001, one will be deployed by the MBARI ROV, and one will remain at MBARI for use as a troubleshooting reference. These instruments should greatly advance our ability to estimate methane hydrate stability, occurrence, and volume, thereby expanding our Nation's ability to estimate methane energy reserves and possible climactic effects of sea level lowering (with subsequent release of methane, a greenhouse gas).