鄂尔多斯盆地高含水油藏李家岔长6油藏成藏机理

Accumulation mechanism of high-water content of Lijiacha reservoir of Ordos Basin

通过70口探井地质资料的统计,分析李家岔长6油藏高含水的原因并探讨该类高含水油藏成藏机理.认为油源不足和低孔、低渗的储层条件是造成本区油藏高含水的重要原因.距离生油中心较远,本地烃源岩相对较差,生烃量小,油气进入长6储层的动力较低,生油中心的油气需通过较长距离的运移才能进人圈闭,油驱水过程进行得不彻底,是高含水油藏形成的主要机理.

The reasons of Lijiacha high water content reservoir was probed and the accumulation mechanism was discussed through the geological data of 70 exploration wells. According to the study on resource rock and reservoir characteristics, lack of hydrocarbon isthe key reason of Lijiacha high water content reservoir. The migration conditions and the low-permeability reservoir are the main causes for the high water content oil pools. The power driving petroleum into the reservoir of the Chang-6 section of the Yanchang Formation can not drive water drastically, which is the main mechanism for high water content reservoir formation.