浙江第四系浅层天然气勘探方法、钻采及集输流程

THE EXPLORATIONAL MATHODS OF QUATERNARY SHALLOW GAS AND ITS DRILLING-PRODUCING-GATHERING PROCESS AND TECHNIQUES IN ZHEJIANG

浙江第四系浅层气主要分布在古河道、古河口沉积的砂体中。在气苗密集地段,采用静力触探,辅以少量横波浅层地震,然后根据所获地下信息部署采气井。根据浙江浅层气的特点(埋藏浅,分布、储量、面积局限)采用"以点带面、点面结合、面中选点、全面展开"的原则,采用简易可行、价廉的勘探方法和钻采、集输流程工艺,以保证少投入、多产出,提高社会和经济效益。

The shallow natural-gas of Zhejiang is mainly distributed in sand bodies deposited within palaeochannels and palaeoesturies. Static exploration and auxiliary shear-wave seismic technique have been exploited in the concentrated areas of natural gas shows,and then,gas-producing wells are disposed based on the subsurface information obtained in exploration. It is not suitable to explore shallow gas in a routine explorational procedure due to the chacracteristics of Zhejiang shallow gas such as shallow burial and limited distribution, reserves and area. Currently, a principle of' promoting exploration in whole area by drawing upon experience gained at key drilling points, combining the key point with whole area investi- gation, choosing the drilling points in the basis of whole area setting, and thus, resulting in a whole area ex- ploration' is drawn up for the shallow gas exploration and development. In order to ensure a higher produc- tion with a lower invesment and enhance both social and econamic benefits, it is necessary to make a wides use of simple, easy and low-costing exploration technology and drilling, producing, gathering process so that the natural gas could be pushed into market as a commodity.