东海西湖凹陷西斜坡断层—岩性油气藏富集评价体系与勘探方向

周荔青; 江东辉; 周兴海; 李昆; 庄建建; 刘闯

doi:10.11781/sysydz202205747

东海西湖凹陷西斜坡断层—岩性油气藏富集评价体系与勘探方向

doi: 10.11781/sysydz202205747

中国石化上海海洋油气分公司, 上海 200120

基金项目:

中石化先导项目“海域资源综合评价与海域高效部署方法研究” YTBXD-01-SH16-2020

详细信息

作者简介:
周荔青(1964-), 男, 博士, 教授级高级工程师, 从事油气勘探综合研究工作。E-mail: zhoulq.shhy@sinopec.com

中图分类号: TE122.35
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出版历程
- 收稿日期: 2022-01-21
- 修回日期: 2022-08-19
- 刊出日期: 2022-09-28

Evaluation system and exploration optimization for fault-lithologic reservoir on the western slope of Xihu Sag, East China Sea Shelf Basin

SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

摘要

摘要: 近年来，东海陆架盆地西湖凹陷西斜坡随着勘探程度的不断提高，勘探思路逐步由构造油气藏转向构造—岩性复合油气藏。通过系统地开展煤系烃源岩生烃潜力评价，明确煤层及暗色泥岩是斜坡带主力烃源岩。通过“源—渠—汇”系统的沉积体系精细研究，明确了西斜坡共发育8种构造—岩性复合圈闭类型；通过油气成藏条件及油气分布规律研究，弄清了始新统平湖组中—上段圈闭有效性是油气成藏主控因素，平湖组下段供烃能力及储层物性为主控因素，并建立了西斜坡油气藏综合评价体系。研究认为，西湖凹陷西斜坡北段迎翠轩地区始新统—古新统三角洲和平南、初阳—宝石地区始新统潮坪—三角洲及平湖斜坡内带为构造—岩性规模储量发育区，是下步有利的勘探方向。
- 复合圈闭 /
- 控砂模式 /
- 主控因素 /
- 评价体系 /
- 西斜坡 /
- 西湖凹陷 /
- 东海陆架盆地
Abstract: With continued progress of exploration degree on the western slope of Xihu Sag of East China Sea Shelf Basin, exploration strategy has gradually changed from structural reservoirs to structural-lithological composite ones. Through the systematic evaluation of the hydrocarbon-generating potential of coal-measure source rocks, it was concluded that coal seams and carbonaceous mudstone are the main source rocks in this area. According to the study of sedimentary system based on the "Source-to-Sink" system, 8 types of structural-lithological composite trap were proposed. Furthermore, the accumulation conditions and distribution characteristics of oil and gas were studied, it is then confirmed that effectiveness of trap is the main controlling factor for oil-and-gas accumulation in the upper and middle members of Pinghu Formation, while the hydrocarbon-supplying capacity and physical properties of reservoir are the main controlling factor in the lower member of Pinghu Formation. Consequently, a comprehensive evaluation system was established. By the means of the comprehensive evaluation of structural-lithological composite reservoirs, the Eocene-Paleocene delta in Yingcuixuan area of the northern segment of the western slope belt, the Eocene tidal flat-delta in Pingnan, Chuyang and Baoshi areas, and the inner zone of Pinghu slope are large-scale reserve areas, which is valuable and favorable for further exploration.
- composite trap /
- sand-controlling models /
- main controlling factor /
- evaluation system /
- western slope /
- Xihu Sag /
- East China Sea Shelf Basin

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图 1 东海西湖凹陷构造区划及地层发育特征

据文献[1]修改。

Figure 1. Structural division and stratigraphic characteristics of Xihu Sag, East China Sea

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图 2 东海西湖凹陷西斜坡始新统平湖组中—上段沉积相

Figure 2. Sedimentary facies of the middle and upper members of Eocene Pinghu Formation on the western slope of Xihu Sag, East China Sea

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图 3 东海西湖凹陷西斜坡构造—岩性复合圈闭模式

Figure 3. Model of structural-lithological composite traps on the western slope of Xihu Sag, East China Sea

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图 4 东海西湖凹陷西斜坡武云亭地区平湖组中—上段、平下段成藏模式

Figure 4. Hydrocarbon accumulation model of lower, middle and upper members of Pinghu Formation, Wuyunting area, western slope of Xihu Sag, East China Sea

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图 5 东海西湖凹陷西斜坡团结亭地区沉积相模式(a)和油气藏剖面图(b)

Figure 5. Sedimentary facies model (a) and reservoir profile (b) of Tuanjieting area, western slope of Xihu Sag, East China Sea

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图 6 东海西湖凹陷西部斜坡带平湖组中—上段砂体有效通道空间系数(a)和油气输导模式(b)

Figure 6. Effective channel space coefficients (a) and hydrocarbon transportation model (b) of middle and upper members of Pinghu Formation, western slope of Xihu Sag, East China Sea

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图 7 东海西湖凹陷西斜坡油气富集评价体系

Figure 7. Evaluation system for oil and gas enrichment in western slope of Xihu Sag, East China Sea

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