盆地覆盖区太古宇岩石类型综合判识方法——以济阳坳陷太古宇为例

摘要/Abstract

摘要： 含油气盆地太古宇逐渐成为现实的油气勘探领域之一。针对油气勘探工作中盆地覆盖区基底——太古宇的岩石类型难以判识的问题，以济阳坳陷太古宇为例，借鉴其周边露头区太古宇的发育特征，综合利用坳陷内钻井取心观察、岩心镜下鉴定结果、录井资料及岩心的岩石地球化学分析等资料，明确了济阳坳陷太古宇的岩石类型包括岩浆岩和变质岩两大类8种，以岩浆岩为主，主要为二长花岗岩，其次为闪长岩。以岩心资料为基础，通过对比分析，筛选了自然伽马、声波时差、补偿中子、补偿密度和光电吸收截面指数等岩性敏感测井曲线，并进一步建立了基于常规敏感测井曲线交会图与曲线叠置法、基于地质统计的Fisher定量判识法等岩石类型判识方法。通过与已知结果对比，岩石类型判识准确率达80%以上，应用上述方法，可以很好地实现盆地覆盖区太古宇岩石类型的综合判识。

关键词: 太古宇, 覆盖区, 岩浆岩, 岩石类型, 量化判识, 济阳坳陷

Abstract: In recent years, two 100 million-ton class subtle reservoirs were found in the Shijiutuo uplift within the Bohai Sea. Exploration practices have proved that new geological understandings provide theoretical guidance and scientific deployment for hydrocarbon exploration discoveries. The mechanism of ternary-factor (ridge-trap-sand) coupling for controlling reservoir in low-amplitude structure guided the significant discovery of the Neogene structural-lithologic reservoir in extra-shallow water delta in the Shijiutuo uplift. The differential hydrocarbon accumulation mode of subtle reservoirs in basin-margin fault transfer zone in steep slope belt facilitated the discovery of the first 100 million-ton class the Palaeogene stratigraphic-lithologic reservoir in the medium-deep layers in the Bohai oilfield. These new geological understandings further promoted technical researches and innovations. As a result, six key technologies have been developed, including the variable-velocity mapping for shallow low-amplitude structure, the description of lithologic traps in sand-rich extra-shallow water delta, the semi-quantitative fault-sand coupling analysis, the exquisite palaeogeomorphic restoration under the tectonic-sedimentary simulation in medium-deep layers, the identification of stratigraphic-lithologic traps in medium-deep layers, and the testing of complex lithologies in medium-deep layers. These technologies provide technical support and assurance for discovering large subtle reservoirs in the Bohai Sea, playing a prospective role for future promotion and application.

Key words: Archaeozoic, covered region, magmatic rock, rock type, quantitative identification, Jiyang depression

王学军, 郭玉新, 王玉芹, 刘宁. 盆地覆盖区太古宇岩石类型综合判识方法——以济阳坳陷太古宇为例[J]. 中国石油勘探, 2016, 21(5): 26-32.

Wang Xuejun, Guo Yuxin, Wang Yuqin, Liu Ning. A synthetic method to identify the rock types of Archaeozoic under the covered region in a basin: an example from Jiyang depression[J]. China Petroleum Exploration, 2016, 21(5): 26-32.

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