辽河坳陷清水洼陷深层油藏形成主控因素研究与勘探实践  

Study of Main Factors Controlling Deep-layer Reservoir and Exploration Practice in Qingshui Sag of Liaohe Depression

作　　者：李龙[1] 李渔刚 韩东[1] Li Long;Li Yugang;Han Dong(Exploration&Development Research Institute of PetroChina Liaohe Oilfield Company,Panjin 124010,China)

机构地区：[1]中国石油辽河油田公司勘探开发研究院

出　　处：《石油科技论坛》2022年第2期1-8,31,共9页PETROLEUM SCIENCE AND TECHNOLOGY FORUM

基　　金：中国石油天然气集团有限公司科技重大专项“辽河油田千万吨稳产关键技术研究与应用”(编号:2017E-1601)。

摘　　要：渤海湾盆地辽河坳陷中浅层已进入高勘探开发程度阶段,亟需在深层开展精细评价工作,落实油藏规模,提高开发效益。S229区块位于清水洼陷北部,沙二段埋深3750~4650m,存在深层储层预测难、成藏条件不清等问题,勘探陷入停滞。以单井资料分析为基础,着力开展“建立源内沉积体系、认识源内储层特征、表征圈闭封闭性能”3方面研究,建立了“进源控烃、成洼控储、复式输导”源内成藏模式。认为水下分流河道是形成储层的优势相带,原生孔隙发育;溶蚀作用和低程度硅质次生加大为原生孔隙保存、次生孔隙形成、渗透性改善提供了有利条件。通过实施“评价开发一体化”,3口井获百吨高产油流,发现深层有利圈闭,为源内深层砂岩油藏勘探开发提供借鉴。The middle and shallow layers of Liaohe Depression in the Bohai Bay Basin are now under the mature exploration and development stage. It is necessary to make detailed evaluation of the deep layers in order to identity the amount of the reserve and improve development performance. Block S229 is located in the northern part of Qingshui Sag. With a buried depth of 3750 to 4650 meters, it is the second member of Shahejie Formation. Exploration came to a standstill owing to the difficulty to predict the deep layers of the reservoir and understand the accumulation conditions. Based on the analysis of single-well data, this paper focuses on three areas of “establishing the intra-source depositional system, understanding the intra-source reservoir characteristics, and characterizing the sealing performance of the trap” and establishes the intra-source accumulating model of “hydrocarbon controlling by means of sourcing,reservoir controlling in formation of the depression, and compound transportation”. It is considered that the underwater branch channel was the favorable facies in formation of the reservoir with development of original pores. Erosion and low-degree secondary silicon increase created the favorable conditions for reservation of original pores, formation of secondary pores and improvement of permeability. Based on “integration of evaluation and development”, the 1-million-ton high-yield oil flow was acquired from three wells, the favorable deep-layer traps were found, providing the experiences for exploration and development of the in-source deep-layer sandstone oil reservoir.

关 键 词：清水洼陷 深层勘探 沉积体系 有效储层 源内成藏模式 

分 类 号：TE122.3[石油与天然气工程—油气勘探]