致密油运聚动力研究：以渤海湾盆地东濮凹陷Wg4井沙三中致密油为例

The driving force study of tight oil migration and accumulation: a case study of the tight oil in Es32 Formation in well Wg4 of Dongpu Sag， Bohai Bay Basin

徐二社 黄娟 鹿坤 蒋宏 周勇水 钱门辉 陶国亮 刘鹏 李志明

中国石化石油勘探开发研究院无锡石油地质研究所，江苏 无锡 214126 中国石油化工集团公司油气成藏重点实验室，江苏 无锡 214126 页岩油气富集机理与有效开发国家重点实验室，江苏 无锡 214126 中国石化中原油田分公司勘探开发研究院，河南 濮阳 457001

Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi 214126, China Key Laboratory of Petroleum Accumulation Mechanisms, SINOPEC, Wuxi 214126, China State Key Laboratory of Shale Oil and Gas Enrichment Mechanism and Effective Development, Wuxi 214126, China Research Institute of Exploration and Development, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China

以东濮凹陷中央隆起带北部的文、卫、濮结合部Wg4井沙三中亚段致密油为例，开展流体包裹体古温压分析，结合盆地模拟技术，动态展现其致密油的运聚动力——烃源岩生烃增压作用。沙三中亚段致密储层于东营期构造抬升时，烃类发生幕式充注，烃包裹体Ⅰ，Ⅱ先后被捕获。致密油充注时期为古近纪末期（约19.5~17.5 Ma）；基于烃包裹体捕获压力、深度可知致密油充注为超压充注，超压系数分别为1.54，1.26。通过生物标志化合物谱图及参数对比追溯的下伏烃源岩，在古近纪末期达到成熟阶段，保留有大量生烃所形成的高压。烃类超压充注与邻近下伏烃源岩生烃增压史具有良好的匹配性，有力地证实了致密油的运聚动力主要为烃源岩生烃增压作用，这对于致密油层段优选具有积极的意义，需聚焦优质烃源岩的发育规模、生烃史以及近源型油气聚集。

Taking the tight oil in Es32 Formationin in well Wg4 of the Wen-Wei-Pu junction in the north of the central uplift in the Dongpu Sag as an example, the paleotemperature and pressure analysis of fluid inclusions are carried out, combined with basin simulation technology, to show dynamically driving force of the migration and accumulation of tight oil: pressurization of hydrocarbon generation for source rock. During the tectonic uplift at Dongying period, episodic hydrocarbon charging occurred in the Es32 tight reservoirs and hydrocarbon inclusions Ⅰ and Ⅱ were captured successively. The tight oil is charged at the end of the Paleogene (about 19.5￣17.5 Ma). Based on capture pressure and depth of the hydrocarbon inclusion, it is found the tight oil charging is overpressured, and the overpressure coefficients are 1.54 and 1.26 respectively. The underlying source rock traced back by the biomarker compound spectrum and parameter comparison has reached the mature stage at the end of the Paleogene, and retained a large amount of high pressure formed by hydrocarbon generation. The tight oil overpressure charging has a good match with pressurization history of the hydrocarbon generation of adjacent underlying source rocks, which proves that the driving force of tight oil migration and accumulation is mainly the pressurization of hydrocarbon generation, and it is important for the optimization of the tight oil strata. It is needed to focus on the development scale, hydrocarbon generation history, and near-source hydrocarbon accumulation of high-quality source rocks.

10.6056/dkyqt202301003