渤海JZ区块变质岩潜山“坡积岩层”岩石特征及工程录井识别方法

谭伟雄，徐 昱，张志虎，王建立，郭喜佳，董国富中海油能源发展股份有限公司工程技术分公司，天津

2中海石油(中国)有限公司天津分公司，天津

渤海JZ区块变质岩潜山“坡积岩层”岩石特征及工程录井识别方法

谭伟雄1，徐 昱1，张志虎1，王建立2，郭喜佳2，董国富11中海油能源发展股份有限公司工程技术分公司，天津

2中海石油(中国)有限公司天津分公司，天津

渤海JZ区块变质花岗岩潜山界面之上局部发育一套较薄的砂砾岩和砂岩(坡积岩层)。该坡积岩层厚薄分布不均，横向可对比性差，为现场钻井地质作业带来诸多问题。利用岩心、岩屑资料分析坡积岩的岩性特征，可分为长石砂岩和岩屑砂岩2种岩性，表明该坡积岩层应为2种不同成因形成的砂岩。通过分析工程录井参数与地层岩性的响应特征，应用钻井工程参数建立功指数和机械比能模型，结合其他录井手段，实现对潜山坡积岩的随钻实时判别。经过研究区多口井的实际资料处理与验证，随钻识别率高达86.7%，应用效果较好。

坡积岩，岩石特征，功指数，机械比能，随钻识别

AbstractThere developed a suite of thinner sandy conglomerate and sandstones (slope rock stratum) over the interface of metamorphic granite buried hill in Block JZ of Bohai Bay Basin. The slope rock stratum was distributed with different thicknesses. Its lateral comparison was poor, by which problems were induced in drilling operations. The lithologic characteristics of the slope rock were analyzed based on core and cuttings data. The rock layer was divided into feldspathic sandstone and lithic sandstone, which indicated that the slope rock stratum was the sandstone of two different geneses. Based on analysis of engineering logging parameters and lithologic response characteristics of the formation, the parameters of drilling engineering are used to establish work index and mechanical specific energy models and combined with other logging means, the slope rock in the buried hill is identified in real-time while drilling. This method is used in several wells in the block with an identification rate of while drilling to 86.7%. It is proven that the method is effective.

KeywordsSlope Rock, Rock Characteristics, Work Index, Mechanical Specific Energy,While Drilling Identification

1. 引言

随着石油钻探认识的不断增加，具有工业性开采价值的潜山油气藏越来越引起人们的重视。渤海JZ区块发现的大型变质岩潜山油气藏与典型的碳酸盐潜山油气藏不同，其主要靠风化壳和裂缝储集油气。在钻进变质岩潜山的作业过程中，常常会在潜山界面之上钻遇一层较薄的砂砾岩和砂岩。该岩层特征与潜山及其上覆岩性具有差异性，由于其主要分布于潜山顶面缓坡区，故称之为“坡积岩”。……