川东长兴组生物礁气藏的资源预测及勘探投资评价

Resources Predication and Evaluation of Exploration Investment of ReefGas Reservoirs in Changxing Formation in Eastern Sichuan

在川东3万km～2埋于地腹的长兴组中至少分布着370～580个点礁,蕴藏着×××～××××亿m～3天然气资源。在当前技术和经济条件下,对一个点礁气藏的勘探风险投资平均为500万元,开发的现值盈利平均为2100万元(含税金)。据风险——收益比,勘探投资和收益基本平衡,不可能获俘用于扩大再生产的利润。因此,采用兼探的办法更可取。

Changxing Formation, buried in subsurface in Eastern Sichuan with a area of 30000km^2, at least contains 370~580 point reefs with gas resources of×××××~××××××million m^3. Under the present technical and economic conditions, on an average, the risk investment in a exploring point reef gas reservoir is five million yuan and the present value of earning from development is 21 million yuan (containing tax). According to risk-income ratio, the exploration investment is basically balanced with the income, which is not able to obtain the profit for expanding reproduction. Therefore, it is more desirable to use the method of attached exploration.