An approach to hydrocarbon-bearing probability and resource characterization of third-order trap
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摘要: 在油气预探阶段钻探目标评价优选是以新区和老区“三新”领域的三级圈闭为着眼点。将同一区带上的相同类型和相似成藏条件的2个或2个以上的四级圈闭统称为1个三级圈闭;其含油气概率和资源价值是部署预探井的关键要素。在预探项目优选决策中,三级圈闭的含油气概率应采用预探井首钻四级圈闭的储层概率、保存概率、充注概率和圈闭概率的乘积,而非所有四级圈闭的含油气概率的算术平均值。三级圈闭的资源量应采用满足首钻四级圈闭成功的前提条件下,三级圈闭可获得的资源量进行表征,而不是各四级圈闭资源量算术相加和至少有1个四级圈闭成功条件下的三级圈闭资源量;三级圈闭资源量大小与各四级圈闭的资源量、含油气概率、四级圈闭之间的地质相关性和首钻四级圈闭的选择有关。Abstract: The wildcats aim primarily at the third-order traps in new areas or the new exploration domains, the new series of strata, and the new types of reservoir in old areas. The third-order trap is referred to two or more than two fourth-order traps which are located at the same hydrocarbon zone, have the same trap type and have the similar geological condition for the hydrocarbon accumulation. The hydrocarbon probability and the resource value of the third-order trap are the key factors to decide whether the drilling is performed or not. In the prospect screening and decision analysis, the hydrocarbon-bearing probability of a third-order trap should use the probability product of the trap, charge, reservoirs and seal of the first-drilled fourth-order trap, not the arithmetic mean of the hydrocarbon-bearing probability of all the fourth-order traps. The resource of third-order trap shall be characterized by meeting the prerequisite that the first-drilled fourth-order trap is successful and it is not the arithmetic sum of each fourth-order trap or the third-order trap resource which is under the condition that at least one of fourth-order trap is successful. The size of the third-order trap resource is related to the resources of each fourth-order trap, the hydrocarbon probability, the geological similarity among the fourth-order traps and the selection of the first-drilled fourth-order trap.
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