黄骅坳陷沧东凹陷孔二段高位体系域细粒相区岩性特征及地质意义

摘要/Abstract

摘要： 岩性是致密油甜点发育的主要控制因素之一，黄骅坳陷沧东凹陷孔二段致密油资源丰富，为了搞清孔二段细粒相区的岩性发育特征，以数百米系统取心、配套分析化验、测井及录井资料为基础，运用高分辨率层序地层学及致密油气富集地质理论，开展了孔二段高分辨率层序地层划分及沉积学特征分析。研究表明，沧东凹陷孔二段为一套完整的三级层序，可进一步划分为4 个四级层序（SQEk₂ ¹—SQEk₂ ⁴）。高位体系域SQEk₂ ¹细粒相区岩矿组成具有成分复杂、优势矿物不发育、泥级长英质碎屑以及方沸石等脆性矿物普遍存在的特点，主要发育了泥页岩、白云岩、砂岩及混合沉积岩四大岩石类型，其中混合沉积岩最为发育，致密砂岩与白云岩是主要的致密储层。这些认识打破了以往对沧东凹陷孔二段细粒相区发育泥页岩烃源岩而不发育储层的旧有认识，有效拓宽了沧东凹陷油气勘探领域。

关键词: 致密油；细粒沉积；白云岩；孔二段；沧东凹陷；黄骅坳陷

Abstract: Lithologic character is one of the main controlling factors for development of tight oil sweet spot. The Ek₂ layer of Cangdong sag, Huanghua depression, is rich in tight oil resource. To clarify the lithologic development characteristics of fine-grained Ek₂ sedimentation, highresolution sequential stratigraphy and tight oil and gas abundance geological theory are used to make high-resolution sequence stratigraphic division of the Ek₂ layer and analyze its sedimentary characteristics on the basis of coring, testing, logging and well-log data. The study indicates that theEk₂ layer in Cangdong sag is a set of intact three-order sequences, which can be further divided into four-order sequences (SQEk₂ ¹—SQEk₂ ⁴). Fine-grained sedimentation in SQEk₂ ¹ high stand system tract is complicatedly composited without favorable minerals development. It is characterized in extensive distribution of brittle minerals, such as muddy felsites debris and analcite. Four main types of rock developed in the area – shale, dolomite, sandstone and mixed sedimentary rock, of which mixed sedimentary rock developed best. Tight sandstone and dolomite are the main reservoirs. The research results refresh the previous views that shale developed as source rock in finegrained sedimentation of Ek₂ layer in Cangdong sag but no reservoirs developed there, effectively expand the oil and gas exploration field in Cangdong sag.

Key words: tight oil, fine-grained sedimentation, dolomite, Ek2, Cangdong sag, Huanghua depression

蒲秀刚　韩文中　周立宏　陈世悦　张　伟　时战楠　杨　飞　柳　飒. 黄骅坳陷沧东凹陷孔二段高位体系域细粒相区岩性特征及地质意义[J]. 中国石油勘探, 2015, 20(5): 30-40.

Pu Xiugang,Han Wenzhong, Zhou Lihong, Chen Shiyue, Zhang Wei, Shi Zhannan, Yang Fei, Liu Sa. Lithologic Characteristics and Geological Implication of Fine-grained Sedimentation in Ek2 High Stand System Tract of Cangdong Sag, Huanghua Depression[J]. China Petroleum Exploration, 2015, 20(5): 30-40.

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