测井地质分析在勘探目标选择中的应用
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摘要
应用现代测井解释技术，对曾钻探地区原有的测井资料进行测井地质分析，可获得对重要石油地质问题的突破性认识。某深井位于东濮凹陷南部的孟岗集洼陷，钻于２０世纪８０年代初，当时该井的地层评价结论导致认为东濮凹陷南部的沙河街组三段、四段较薄和油气资源贫乏，以致后来勘探投入很少。迄今该井仍是该区最深的探井（井深５５９８ｍ），有当时的３６００测井系列测得的９条常规测井曲线。在东濮凹陷西洼南部探井选位的前期研究中，根据该井的测井资料情况，做了三方面处理和研究工作：①地层分析和地层压力评价，认为 ５１９８．５ｍ以下的地层不是三叠系而仍是下第三系，沙一段和沙三段—沙四段存在高压异常；②重新解释油气层和评价储集层，在沙三段—沙四段发现６层１２、８７ｍ厚可疑油层；③评价油源岩，认为沙一段和沙三段—沙四段油源岩具有较好的生油能力。在该井测井评价结论的基础上，结合地震资料处理对该区进行石油地质综合评价，使勘探面积增加 １０００ｋｍ～２，预测石油资源量 １．２ｘ１０～８ｔ，提出 ８个有利构造，首选其中的方里集构造，成功地钻了某深８井。图３表４参１（王孝陵摘）
By using modern log interpretation technology on logging datum about old areas, which have been drilled, great breakthrough may be made in the important petroleum geology issues. Well Moushen is located in Menggangji depression, south of Dongpu seg. It was first drilled in the beginning of 80's. The evaluation of the formation led to the conclusion that Members 3 and 4 of Shahejie Formation are thin and the oil and gas resource are spare in south area of Dongpu seg. Since that time, so little was input in the exploration of it. Well Moushen is still the deepest testing well in this area, having 9 logging curves produced by 3600 log series. During the preresearch on the testing well location selection in the south of western depression, three kinds of process and research work have been done according to the log datum on Well Moushen: (1) Formation analysis and formation pressure evaluation which verdicts that formation under 5198.5m is not of Trias, whereas is still in Permian, and abnormal formation pressure phenomenon exists in Members 1 and 3-4 of Shahejie Formation; (2) Re-interpretation of oil and gas formation and evaluation of reserve formation; (3) Evaluation of oil source rock. Members 1 and 3-4 source rocks of Shahejie Formation have good capability of oil generation. On the basis of the conclusion made on Well Moushen logging evaluation, combined with seismic datum process, comprehensive oil geology evaluation about this area was made. As a result, exploration area increased 1000km~2, oil resource volume was forecasted to 1.2×10~8t, and 8 favorable structures were proposed. Fangliji was selected preferentially and Well Moushen-8 was successfully drilled.
By using modern log interpretation technology on logging datum about old areas, which have been drilled, great breakthrough may be made in the important petroleum geology issues. Well Moushen is located in Menggangji depression, south of Dongpu seg. It was first drilled in the beginning of 80's. The evaluation of the formation led to the conclusion that Members 3 and 4 of Shahejie Formation are thin and the oil and gas resource are spare in south area of Dongpu seg. Since that time, so little was input in the exploration of it. Well Moushen is still the deepest testing well in this area, having 9 logging curves produced by 3600 log series. During the preresearch on the testing well location selection in the south of western depression, three kinds of process and research work have been done according to the log datum on Well Moushen: (1) Formation analysis and formation pressure evaluation which verdicts that formation under 5198.5m is not of Trias, whereas is still in Permian, and abnormal formation pressure phenomenon exists in Members 1 and 3-4 of Shahejie Formation; (2) Re-interpretation of oil and gas formation and evaluation of reserve formation; (3) Evaluation of oil source rock. Members 1 and 3-4 source rocks of Shahejie Formation have good capability of oil generation. On the basis of the conclusion made on Well Moushen logging evaluation, combined with seismic datum process, comprehensive oil geology evaluation about this area was made. As a result, exploration area increased 1000km~2, oil resource volume was forecasted to 1.2×10~8t, and 8 favorable structures were proposed. Fangliji was selected preferentially and Well Moushen-8 was successfully drilled.
引文
1 O.塞拉.测井资料地质解释.北京:石油工业出版社,1992.380- 423.
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