KEY TECHNIQUES FOR PREDICTION OF LATE EOCENE FAN DELTAIC RESERVOIR COMPLEX ON SOUTHERN SLOPE OF WEIXINAN DEPRESSION AND THEIR PETROLEUM GEOLOGICAL SIGNIFICANCE
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摘要:
涠西南凹陷南斜坡晚始新世流一段时期发育自南向北推进的扇三角洲沉积，而内部多期朵叶体又具有纵向叠置、横向连片的特点，从其沉积内幕的复杂性和岩性圈闭难识别、难预测的特点入手，从层序约束下的砂体雕刻、复杂储层预测以及油气地质意义方面对该区细致剖析，逐一寻找垂向相序变化规律、优质储层的展布规律、油气富集规律，从而提升该区的整体评价价值。研究得出，该区流一段下部可细分为两个四级层序，共识别出5期三角洲朵叶体，13套纵横叠置的单砂体，而沉积水动力条件应是导致其非均质性强、物性差异的根本原因。结合油气成藏认识，首次提出自北向南三排构造的不同成藏主控因素和研究方向，对该区隐蔽圈闭的预测和精细评价具有一定的指导意义，也进一步夯实了涠西南增储稳产的信念。
Abstract:Fan deltaic systems formed during the Liushagang Stage of Late Eocene are well developed on the southern slope of the Weixinan Depression from south to north. Multi-periodic deltaic lobes are superimposed in both vertical and horizontal sequences. Owing to the complexity of deposits, it is quite difficult to identify and predict lithologic traps in oil exploration. In this paper, we made detailed description of sand bodies, prediction of complex reservoir and evaluation of oil and gas geological systems under the constraints of sequence stratigraphy. The vertical change in facies sequences, the distribution pattern of high quality reservoirs, and the oil and gas enrichment zones are identified as the basis for further evaluation of the region. It is found by the research that there are two fourth order sequences in the lower part of the L1 Member, as well as five stages of delta lobes and thirteen single sand bodies are superimposed vertically and horizontally. The changes in depositional hydrodynamic conditions are supposed to be the basic reason leading to the strong heterogeneity and the physical differences of reservoirs. Based upon the study of major control factors of oil accumulation, we, for the first time, proposed three exploration zones in an order from north to south. The results are believed useful for future oil exploration and production in the Weixinan Depression.
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Key words:
- L1 Member /
- fan delta /
- sequence /
- reservoir /
- hydrocarbon accumulation /
- the Weixinan depression
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表 1 涠西南凹陷南斜坡三排构造的成藏要素分析
Table 1. Analysis of reservoir-forming factors for the three structural zones on the southern slope of Weixinan Depression
构造 钻井 相带 储层 埋深/m 运聚方式 圈闭 成藏主控因素 北块(涠洲A构造) A1—A9 湖底扇、扇三角 洲前缘、浊积砂 泥夹薄砂，砂泥互层 2 200～2 500 近油源包裹或底部岩面式充注 岩性、构造+岩性 储层物性 研究方向 低位域早期、高位域晚期，具有一定厚度的水下分流河道、湖底扇砂体 中块(涠洲B构造) B1—B2 扇三角洲前缘 砂泥互层 2 000～2 300 近油源底部岩面式、侧向充注 构造+岩性 圈闭；储层非均质性 研究方向 侧封条件较好、厚度横向分布稳定的水下分流河道、河口坝砂体 南块(涠洲C构造) C1—C5 扇三角洲前缘 砂夹薄层泥岩 1 700～2 100 远油源侧向运移充注 构造+岩性、构造 运聚；圈闭 研究方向 最大湖泛之下、侧封条件较好的L1Ⅲ—Ⅴ油组的水下分流河道砂体 
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